Most hot spring inns in Japan sell you one night, dinner and breakfast included. A toji (湯治) inn sells you a fortnight and a kitchen.
Toji means a long stay at a single spring for the sake of your body rather than your holiday. The inns that still run this way are usually split into two parts under one roof: a ryokan-bu with meals and a toji-bu — a self-catering wing with a shared kitchen, a coin laundry and much plainer rooms. Sukayu Onsen divides its 139 rooms exactly this way. Osawa Onsen keeps a building over 200 years old as its self-catering wing. Goshogake Onsen, Ryokan Ohnuma and Takashige Ryokan all do the same.
This guide lists 21 such inns across 12 prefectures, sorted into three types: inns with a self-catering wing, inns built around strongly mineralised water, and inns where the water is lukewarm enough to sit in for an hour. Water type, pH, source temperature and whether the bath is free-flowing are on each inn's data page.
What this guide covers:
- What toji actually is, defined by how the inns are built rather than by tradition
- Three types of toji inn, and which one suits a first long stay
- 21 inns across 12 prefectures with data pages
- Booking, seasons, mixed bathing, tattoos, payment and getting there without a car
What Toji Is
Toji is a stay of several days or weeks at one source, taken for the body. The word covers both the practice and the places built for it.
Japan recognised this formally. In 1954 the government designated its first three kokumin hoyo onsenchi (National Health Resort Hot Springs), and one of them was Sukayu Onsen (酸ヶ湯温泉), high on Mount Hakkoda in Aomori. The other two were Shima in Gunma and Nikko Yumoto in Tochigi.
The older evidence is in the sayings. Goshogake Onsen (後生掛温泉) in Akita is known by a line that translates roughly as "come by horse, leave on wooden clogs" — arrive too weak to walk, leave on your own feet. Kamasaki Onsen (鎌先温泉) in Miyagi has been called Ou no kusuriyu, the medicinal water of the northeast, since a farmer struck the spring with the tip of his sickle in 1428. Namegawa Onsen (滑川温泉) in Yamagata was opened as a toji ground in 1763 under a permit from the Uesugi lords of Yonezawa, and the Fukushimaya family has kept the spring for fourteen generations.
One caution. Japanese law lists tekiosho — indications, not cures — for each water type, typically neuralgia, muscle and joint pain, and poor circulation. Hot springs are not medicine. If you have a medical condition, ask a doctor before planning a long soak.
Three Types of Toji Inn
Type 1: Inns with a self-catering wing
You rent a room, use the shared kitchen and cook. Osawa Onsen Jisuibu Tojiya (大沢温泉 自炊部・湯治屋) in Iwate keeps this wing in a building more than 200 years old, separate from the modern Sansuikaku ryokan on the same grounds. At Kuroyu no Takatomo Ryokan (黒湯の高友旅館) in Miyagi, the main building facing the road is the ryokan side and a 1977 annexe is the toji side.
Facilities vary widely. Wakamatsuya Murai Rokusuke (若松屋村井六助) in Yamagata has two cooking areas and a coin laundry. Takeya Ryokan Honkan (竹屋旅館 本館) in Kagoshima provides a shared kitchen with tableware, a refrigerator, a stove, a microwave, a washing machine and a sink. Geto Onsen Kanko Hotel (夏油温泉観光ホテル) in Iwate serves no meals at all — it reopened on 3 October 2025 as a room-only, self-catering inn.
Self-catering toji survives outside the northeast too. Ryokan Shirasagi (旅館しらさぎ) at Tsubaki Onsen in Wakayama is one of the few inns in the Kansai region still set up for it. Nakashima Onsen Ryokan (中島温泉旅館) in Kagoshima keeps three self-catering rooms on the ground floor and lends cooking equipment free of charge.
Type 2: Inns built on strongly mineralised water
Here the point is the water, and you build up your tolerance over days. Tamagawa Onsen (玉川温泉) in Akita measures pH 1.2. Its vent, called Obuke, discharges 9,000 litres a minute and runs off as a stream three metres wide. It opened as a toji ground in 1885 and has drawn long-stay guests from across the country for over 140 years.
Sukayu Onsen measures pH 1.8. Its bath hall, Hiba Sennin-buro, is built entirely of hiba cypress, covers about 260 square metres and has no supporting pillars. Four separate sources feed it, each at a different temperature.
Ryokan Nikaido (旅館二階堂) at Nuruyu Onsen in Fukushima posts an analysis reading acidic iron-aluminium-sulphate spring, pH 2.9, source 31.8°C — an alum-vitriol water long associated with eye complaints. The Nikaido family acquired the rights to the spring in 1803. Three thatched buildings on the site were listed as Registered Tangible Cultural Properties in 2017.
Type 3: Inns where the water is lukewarm
Not every toji bath is hot. Nishiyama Onsen Motoyu Horaikan (西山温泉 元湯 蓬莱館) in Yamanashi runs at 34–38°C, pH 9.1, rising without pumps. It has self-catering rooms reserved for toji guests and takes long stays with or without meals.
The source at Yuya Onsen Okudaya (湯屋温泉 奥田屋) in Gifu is a 15.4°C cold mineral spring. Of 6,451 mg total dissolved content, 1,947 mg is free carbon dioxide. It comes out of the spout clear and prickling, and turns yellow-brown in the tub. It is heated by heat exchanger, never diluted.
Futamata Radium Onsen (二股らぢうむ温泉) in Hokkaido has no kitchen at all, yet has taken long-stay guests for over a century across 53 rooms sleeping 130. Its calcium carbonate terrace dome was designated a Hokkaido Natural Monument in 1965.
How These 21 Were Chosen
Three conditions.
- You can stay the night. Day-trip-only baths are excluded, since the subject is the long stay.
- The inn itself has a self-catering wing, a long-stay plan, or a documented history as a toji ground. Inns whose descriptions merely mention the word were dropped.
- Geographic spread. Toji inns really do cluster in the northeast, but Hokkaido, central Japan, Kansai and Kyushu are represented, across 12 prefectures.
The numbering follows how widely each inn is carried by Japanese online booking sites. Being listed is not the same as being bookable, though — read the notes below before you settle on one.
1. Sukayu Onsen (酸ヶ湯温泉) — Aomori City, Aomori
Quality
Sulfur Spring
Iron Spring
Temp
48℃ to 49℃
Supply
Natural Source Flow
pH
pH 1.7
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 1000JPY/Child 500JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 | 07:00 - 18:00 |
Deep in a river valley carved by the Toyosawa River in Hanamaki City, Iwate Prefecture, Osawa Onsen stands as a lone inn whose origins are said to reach back some 1,200 years to the Heian period, when the general Sakanoue no Tamuramaro is believed to have healed an arrow wound in its waters during a campaign against the Emishi. Within its grounds sit two contrasting lodges: the modern ryokan Sansuikaku, and the Jisuibu Tojiya, a self-catering lodge occupying a wooden building more than 200 years old that still carries the unmistakable atmosphere of an old-fashioned toji retreat. The story is further enriched by the young Kenji Miyazawa, who is said to have often accompanied his devout father here when the inn doubled as a venue for Buddhist gatherings.
The inn draws on a single source, an alkaline simple hot spring (hypotonic) with a silky, gentle texture at a pH of around 9.0. The source emerges at roughly 51°C and flows at about 700 liters per minute, valued for easing neuralgia, muscle and joint pain, and stiff shoulders, drawing long-term toji guests to this day. The two principal baths, Osawa no Yu and Yakushi no Yu, run largely on a source-fed, non-recirculated basis, while the larger baths on the Sansuikaku side add water in summer and rely partly on circulation, making the property as a whole a partial-kakenagashi facility.
The true highlight of the Tojiya is Osawa no Yu, a sweeping mixed-gender open-air bath set directly beside the murmuring Toyosawa River with no walls to block the view of the water and greenery beyond; a women-only period runs from 8:00 to 9:00 p.m. Guests can also move on to the women-only open-air bath Kawabe no Yu, the gender-separated indoor bath Yakushi no Yu, and the semi-open-air Toyosawa no Yu over at Sansuikaku, sampling several distinct baths in a single stay. The lodge retains a communal kitchen where visitors cook their own provisions on coin-operated gas stoves, while those who prefer not to self-cater can eat at the on-site restaurant Yahagi, known for local Iwate dishes and handmade soba noodles.
Day-trip bathing costs 700 yen for adults and 400 yen for children, available from 7:00 a.m. to 8:30 p.m. every day of the year. Room-only stays start from 4,650 yen, still following an old-style toji pricing structure in which items like yukata robes are billed as extras — a pricing system that is itself a living record of the toji culture. About 15 minutes by car from Hanamaki-Minami Interchange on the Tohoku Expressway, and roughly 30 to 40 minutes by bus or shuttle from JR Hanamaki Station, Osawa Onsen rewards visitors year-round, whether for the valley's autumn colors and fresh spring greenery or simply the open-air freedom of its mixed-gender bath.
Quality
Alkaline Simple Hot Spring
Temp
41℃ to 51℃
Supply
Partial Natural Flow
pH
pH 9
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 700JPY/Child 400JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 | 07:00 - 20:30 |
Deep in the mountains of Nishiwaga, Iwate Prefecture, cradled within the Ou Mountain range, lies Yugawa Onsen. At the very end of its hot spring street, where the road itself comes to a stop, stands Takashige Ryokan. Said to have been founded in the mid-Taisho era, the inn has spent nearly a century upholding its founding philosophy that hot springs contribute to human health, carefully preserving the toji (therapeutic bathing) culture of the region. Yugawa Onsen itself is blessed with three abundant sources -- Deguchi-no-yu, Naka-no-yu, and Oku-no-yu -- and has long been a beloved retreat for visitors from both Iwate and Akita.
The inn's true charm lies in the sheer abundance of its private source, Takashige-no-yu, which discharges around 800 liters per minute at a source temperature of 78 degrees Celsius and a pH of 7.7, making it a mildly alkaline, high-temperature spring. Classified as a sodium chloride-sulfate spring, its waters leave bathers with a deep, long-lasting warmth. Run largely on a source-fed basis, the baths let guests soak in freshly drawn mineral water -- so plentiful, in fact, that the entire building's heating runs on geothermal warmth alone.
Eight baths in total, four each for men and women, await visitors, including spacious indoor baths and open-air pools. The undisputed highlight is the 'Golden Bath', a Showa-era holdover whose gilded walls and lucky tile murals of the deities Ebisu and Daikoku give the whole room an auspicious glow. A geothermally heated sauna rounds out the lineup, letting guests enjoy a mini bathing tour within a single inn. The building itself is far from new, but it is kept spotlessly clean, and its modest wooden architecture as a single standalone inn still carries the unmistakable character of an old-fashioned toji lodge. Guests can choose between the self-catering toji wing and the full-service ryokan wing, the latter known for hearty meals built around local mountain ingredients, most famously a whole grilled kichiji rockfish.
Day-trip bathing costs 300 yen for adults and 150 yen for children, and the baths are open year-round from 8:00 a.m. to 6:00 p.m. Getting there is straightforward: about 10 minutes by reservation-based shared taxi (200 yen per person) from JR Kitakami Line's Hotto Yuda Station, or roughly 15 minutes by car from Yuda IC on the Akita Expressway. Late autumn through early spring is an especially rewarding time to visit, when the surrounding mountains lie under snow and the inn takes on a hushed, toji-retreat atmosphere, though winter travelers should always check road conditions in this famously snowy corner of Nishiwaga. With several other toji hot springs scattered throughout the town, Takashige Ryokan makes an excellent base for exploring the region's bathing culture.
Quality
Sodium - Chloride - Sulfate Spring
Temp
40℃ to 78℃
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 7.7
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 300JPY/Child 150JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 | 08:00 - 18:00 |
At the eastern gateway to the Naruko hot spring region, in the Washinosu district of Higashi-Naruko Onsen, stands a single therapeutic inn that hot spring devotees travel across Japan to reach almost as a pilgrimage. Takatomo Ryokan was founded in 1925. This stretch of land once held a bathing villa of the Sendai domain lords, and among the springs of Naruko it has long carried a deeply rooted culture of the extended cure stay. The inn is still known by the name that matters most here: Kuroyu no Takatomo Ryokan, Takatomo of the black water. The main wing beside the road houses regular guests, while the annex added in 1977 remains a self-catering wing for long stays. Creaking floorboards, faded signboards, a rest room for cooling off after a soak: the interior itself, suspended somewhere in the Showa era, accounts for half the reason people come.
The other half is the water. Takatomo owns four private sources and serves every one of them free-flowing, with no heating, no circulation filtering and no disinfection. The signature mixed-gender bath, Kuroyu, draws on the Sachi-no-Yu source: a sulfur-bearing sodium bicarbonate spring at 59.8 degrees Celsius, pH 6.8, with total dissolved solids of about 2,396 mg per kilogram. True to the name, the water passes beyond dark green and reads simply as black, and the moment you step into the bathhouse a fierce petroleum aroma, described variously as tar or heavy oil, hits the back of the nose. Locally it is also called the only iron-bearing natural radium spring in the Naruko region, and the warmth it leaves in the body afterward is genuinely unusual. The women's Ramune bath and the men's Hyotan bath draw on a different source, Tama-no-Yu, a sodium bicarbonate spring at 49.3 degrees Celsius and pH 6.5, held at around 45 degrees in the tub, where brown mineral flakes drift through water with a clearly slippery touch. Tasting the distinct character of each source within a single inn is the particular luxury of a stay here.
That said, the full arrangement of four sources and seven tubs, spread across one mixed bath, two women's baths, one men's bath and two private baths, is not always in service. Source trouble has limited recent operation to three rooms: Kuroyu, the Ramune bath and the Hyotan bath, leaving the pool bath, the Momiji bath and the family bath closed. There is no open-air bath; everything is indoors. Even so, plenty of enthusiasts insist the black bath alone justifies the drive. Day-trip bathing runs from 10:00 to 16:00 at 500 yen for adults and 250 yen for children, pricing that belongs squarely to the old cure-inn tradition, with free parking for around 50 cars. Overnight guests also have a women-only slot in Kuroyu from 20:00 to 21:30.
A few practical points are worth knowing before setting out. Closing days are irregular, and there are days when day-trip bathing simply is not accepted. The official website no longer exists, and for overnight stays reservations cannot be placed through online booking sites while the telephone frequently goes unanswered. In short, this is an inn where going on a day you can go is itself the best strategy. Access is startlingly easy for a place with such a remote reputation: a three-minute walk from Naruko-Gotenyu Station on the JR Rikuu East Line, or roughly 40 minutes from Furukawa IC on the Tohoku Expressway via Route 47. The oil-like scent lingers in hair and clothing, so bring a change of clothes if that troubles you. The Naruko region is also celebrated for autumn foliage, and a visit between mid-October and early November, paired with the Naruko Gorge, makes for the richest trip.
Quality
Sulfur-containing - Sodium - Bicarbonate Spring (Hydrogen Sulfide Type)
Sodium - Bicarbonate Spring
Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring
Temp
42℃ to 45℃
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 6.8
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 500JPY/Child 250JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 | 10:00 - 16:00 |
Book your stay
Naruko Onsenkyo has been drawing bathers for more than a thousand years and holds nine of the eleven spring types recognised by Japan's Ministry of the Environment, a concentration matched almost nowhere else in the country. Higashi-Naruko, the eastern gateway to the area, once housed the goten-yu bathhouse reserved for the Date lords of Sendai during the Edo period, yet it never developed an entertainment quarter and survives instead as a quiet village of self-catering therapeutic bathing. Isazen Ryokan opened here in 1941 and stands modestly along a flat lane just three to five minutes on foot from Naruko-Gotenyu Station on the JR Rikuu East Line. Step through the entrance, however, and you enter a world painted entirely in Hanshin Tigers colours: a team curtain in the lobby, a pennant of former slugger Tomoaki Kanemoto in the corridor, cabinets of memorabilia in the changing room, and tiger-striped stools and buckets in the bath itself. The combination of honest toji-inn plainness and unbridled baseball devotion has earned the place a reputation among onsen enthusiasts as a shrine for Tigers fans.
What truly distinguishes Isazen is the chance to bathe in three genuinely different waters under one roof. The inn's own blended source, Isazen No. 1 and No. 2, emerges at 42.9C with a pH near 7.0 as a sodium bicarbonate spring; because it carries radium it is known locally as the tansansen, or carbonated bath. Sinking into its clear water brings a distinct sensation of pores opening, and the touch on the skin is light and clean. The tekkosen, or iron bath, mixes the inn's Isazen No. 3 source with the Higashi-Naruko communal supply at 45.1C and pH 7.2; iron content turns it the brown of oolong tea and the heat works slowly and deeply into the body. The large bath and open-air tub are fed by the Arai No. 2 and No. 5 blend at 66.4C and pH 7.4, a sodium bicarbonate-chloride-sulphate spring that gives off Higashi-Naruko's signature abura-shu, an oily aroma reminiscent of heavy fuel or vinyl. That smell is evidence of water rising through ancient plant strata, and it is precisely why bathers travel from across Japan to this small village. Every tub is supplied as free-flowing spring water, hot enough at the source that no heating is required.
The layout of the baths is as characterful as the inn. The mixed-gender indoor bath Isazen no Yu sets the carbonated and iron tubs side by side, letting you move between them and compare the two waters directly on your skin. Men use the large bath Daigoji no Yu, women the Non-chan no Yu with its attached open-air tub, and a private indoor bath is available as well. All five tubs carry real spring water, so a miniature hot spring tour is possible without leaving the building. Note that towels wrapped around the body and bathing garments are not permitted in the mixed bath, so anyone uncomfortable with that should choose the single-sex baths. The wooden building is unadorned and old-fashioned, and cats wander the corridors at will. This is not a place for modern amenities, but the atmosphere of an inn where only hot water and unhurried time exist is something you will not find elsewhere.
Practically speaking, day-trip bathing costs 500 yen for adults and 300 yen for children from 10:00 to 18:00, with no closing days; some sources list hours until 20:00, so a phone call ahead is wise. Two Naruko Onsenkyo yumeguri tickets are also accepted. Free parking for 50 cars is generous by Higashi-Naruko standards. Overnight stays centre on room-only and self-catering toji arrangements, starting around 11,000 yen for two people including tax, with 23-hour stay plans and extended multi-night options. Rooms come with bedding plus pots, tableware, a rice cooker and a refrigerator, and a shared kitchen area (10 yen per 10 minutes) makes proper cooking straightforward. By car it is about 30 minutes from the Furukawa IC on the Tohoku Expressway via Route 47; by rail, transfer at Furukawa to the Rikuu East Line for Naruko-Gotenyu, checking the timetable carefully since services are sparse. The best seasons are late October to early November, when autumn colour fills nearby Naruko Gorge, and deep winter, when snow outside makes the hot water feel all the more restorative. Pair a visit with Naruko Gorge, the Japan Kokeshi Doll Museum, or the historic public bath Taki no Yu in neighbouring Naruko Onsen for a bathing trip built around Higashi-Naruko's remarkably dense waters.
Quality
Sodium - Bicarbonate Spring
Sodium - Bicarbonate - Chloride - Sulfate Spring
Temp
42℃ to 45℃
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 7
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 500JPY/Child 300JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 | 10:00 - 18:00 |
With over 600 years of history, Kamasaki Onsen is known as "Oshu no Kus uri-yu" (medicinal bath of Oshu) and "Kizu ni Kamasaki" (Kamasaki for wounds). The central establishment is Mogamiya Ryokan, founded in 1789.
The current main building, constructed during the Taisho era, is a dignified three-story wooden structure in pure Japanese style. The interior, carefully maintained by master carpenters and craftsmen, exudes historical depth and warmth.
The spring water, containing iron salt, produces a grayish light brown cloudy bath. True to its "Kamasaki for wounds" reputation, it is said to be effective for cuts, burns, and post-surgical recovery. Despite limited water volume, the inn adheres to traditional hot spring practices without adding water or circulating.
Self-catering rooms (20+ rooms) are still available for long-term spa therapy guests, preserving Japanese hot spring culture.
Quality
Sodium - Chloride - Sulfate Spring
Temp
36℃ to 42℃
Supply
Natural Source Flow
pH
pH 7.1
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 800JPY/Child 400JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 |
Tamagawa Onsen is renowned for having Japan's most acidic hot spring water. With a pH of 1.05, it boasts an intensely acidic character, and the outflow from a single source reaches 9,000 liters per minute - the highest in Japan.
From the source called "Obuki" (Great Gusher), 98°C hot water erupts with a thunderous roar - a truly spectacular sight. The spring quality, based on hydrochloric acid with radium content, is extremely rare worldwide.
The large bathhouse offers various pools including 100% source water baths, 50% source water baths, and mildly acidic pools that can be selected according to physical condition. The facility is also famous for natural bedrock bathing, where visitors can experience geothermal therapy.
As the main building closes in winter, the year-round operation of Shin-Tamagawa Onsen is recommended during that season.
Quality
Chloride Spring
Carbon Dioxide Spring
Iron Spring
Temp
---℃ to 98℃
Supply
Natural Source Flow
pH
pH 1.2
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 800JPY/Child 400JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 |
Located at approximately 1,000 meters elevation within Hachimantai National Park, Goshogake Onsen has long been known for its high therapeutic effects, celebrated in the saying "Come by horse, return with geta sandals."
The signature attraction is the "box steam bath," where bathers place only their heads outside wooden boxes. This traditional bathing method uses steam to warm the body, preventing dizziness while promoting perspiration. Seven bathing methods are available, including the "mud bath" with excellent beautifying effects, the "volcanic bath" with pleasant bubbles, and a natural "steam sauna."
The lodging features an "ondol structure" where steam is passed beneath the floor to warm rooms, providing therapeutic benefits even while sleeping.
The nearby "Goshogake Nature Research Trail" offers close observation of volcanic activity including mud volcanoes and fumaroles.
Quality
Simple Sulfur Spring
Temp
42℃ to 88℃
Supply
Natural Source Flow
pH
pH 3.2
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 800JPY/Child 400JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:30 - 14:00 | 10:30 - 14:00 | Closed | 10:30 - 14:00 | 10:30 - 14:00 | 10:30 - 14:00 | 10:30 - 14:00 | 10:30 - 14:00 | 10:30 - 14:00 |
Hijiori Onsen lies at the bottom of a deep gorge carved by the Dozan River in Okura Village, in the far north of Yamagata Prefecture. The spring is said to have been opened twelve centuries ago, and the village name, which literally means broken elbow, comes from a legend about an elderly monk who fell from the cliffs above and mended his shattered arm in the water. A dozen-odd inns are packed onto the narrow floor of the valley, steam drifting between them and wooden geta clattering on the pavement, and the effect is that of a working cure village rather than a resort. Wakamatsuya Murai Rokusuke sits close to the middle of it. The inn has taken in bathers since the late Edo period, and a framed photograph inside shows the main building as it stood around 1923. Hijiori's famous early morning market, held from spring through autumn, sets up on the street directly outside, and guests can watch the stalls fill from their rooms.
What sets this inn apart is its own private source. Most houses in Hijiori draw from the communal springs managed by the local cooperative, but Wakamatsuya Murai Rokusuke is one of the few with water of its own, a supply named Murai Gensen that welled up inside the building roughly sixty years ago. It emerges at 43.0 degrees Celsius with a pH of 6.2 and around 1,853 mg of dissolved minerals per kilogram, classified as a sodium chloride and bicarbonate spring carrying both iron and dissolved carbon dioxide. Sink into it and fine bubbles form across the skin within moments. A taste reveals mild salt, a faint broth-like savour and an unmistakable fizz, with an iron note that stays gentle rather than metallic. Around the spout you can actually watch the gas breaking loose from the water.
The bathing arrangement is simple: one large bath each for men and women, and a single private bath called Sachi no Yu. The interesting part is that the two are fed differently. The large baths mix the cooperative's number two and three sources with Murai water, giving a character close to Hijiori's public bathhouses. Sachi no Yu runs mostly on Murai Gensen, faintly ochre but clear enough to see the bottom, and far more carbonated. Being able to compare two distinctly different waters under one roof is a luxury only a privately sourced inn can offer. Sachi no Yu takes its name from Prince Takamatsu, who named it during a stay here. Beside the entrance, a free-flowing foot bath operates from early April through November, and it is rarely empty once the morning market breaks up.
The inn is small: fourteen guest rooms in all, eight of them with private toilets, and a capacity of thirty. Check-in opens at 13:00, and dinner is served in a private dining room sized to your party. The proprietress cooks local mountain vegetables and produce into a generous spread of home-style dishes that has earned the place a reputation well beyond what a cure inn usually attracts. Two self-catering kitchens and a coin laundry support the old style of long-stay bathing. Two-meal stays start in the 7,000 yen range on the cure plan and run to around 12,000 yen on the standard plan, and Wi-Fi reaches the whole building, which matters on a long visit. Day bathing is currently suspended according to the inn's website, so an overnight stay is the way to reach this water. From JR Shinjo Station, the Okura village bus on the Hijiori Yukemuri Line takes about 55 minutes and costs 600 yen. Route 458 between Sagae and Hijiori is closed indefinitely, so drivers should also route via Shinjo. Hijiori is among the snowiest inhabited places in Japan, with drifts that reach the eaves in midwinter, so the choice is between the deep hush of a buried village and the bustle of the market season from spring to autumn.
Quality
Sodium - Chloride - Bicarbonate Spring
Supply
Natural Source Flow
pH
pH 6.2
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip N/A
The story of Namegawa Onsen begins in 1476, when a village samurai from Osawa named Saito Morifusa is said to have lost his footing while fording the Maekawa river. As he fell, the stone he caught himself on was warm, and he realized that hot water was welling up through the riverbed. The place name Namegawa, literally the slippery river, preserves that plain and rather humble discovery. The spring was formally developed as a therapeutic bathing lodge in 1763, when Sasaki Masanao secured permission from the Uesugi lords of the Yonezawa domain to build an inn on the site. More than two and a half centuries later, the Fukushimaya family still keeps the springs, now in its fourteenth generation. The inn is counted among the Yonezawa Hatto and belongs to the Japan Association of Secluded Hot Spring Inns.
The water is a sulfur-bearing sodium-calcium bicarbonate-sulfate spring, hypotonic and neutral, with a pH of about 7.0. That neutrality is unusual for a sulfur spring and makes the bath notably gentle on the skin. All three of the inn's sources rise on their own without pumps: the lower source emerges at 40.4 degrees Celsius and the upper at 53.6, together yielding roughly 150 liters per minute. Nothing is added and nothing is taken away. There is no dilution, no reheating, no recirculation and no chlorination, so the water arrives in the tubs exactly as it leaves the rock, milky white shading to a pale blue, with a distinct scent of sulfur. The supply is generous enough that fresh water spills continuously over the rims of the baths.
Four bathing areas share the site. Indoors there is a stone-built mixed-gender bath known as the Ohuro and a separate bath reserved for women. Outdoors, a mixed-gender rock pool looks down on the Maekawa rapids, and a cypress tub sits closer still to the water. The rock pool, framed by fresh green in early summer and by red maples in autumn, is one of the most photographed open-air baths in Yamagata, and women-only hours are set aside there each day. The cypress bath can be reserved privately by overnight guests in the evening. Because the inn stands at around 850 meters with no power lines or water mains reaching it, it runs on its own small hydroelectric generator and stores its water in tanks. Twenty-five guest rooms are available, with breakfast and dinner served in the room, and a self-catering wing for longer therapeutic stays survives alongside them.
The inn opens from late April to early November and closes for winter, when the access road is left unplowed. Day-trip bathing is offered from 9:00 to 16:00 for 700 yen per adult and 350 yen for elementary school children and younger; towels are sold rather than lent, so bringing your own is wise. Overnight rates start at 13,700 yen per person with two meals, or from 3,200 yen for a self-catering room in the therapeutic wing. By car the inn is about 45 minutes from the Yonezawa-Chuo interchange on the Tohoku-Chuo Expressway, though the last stretch is a narrow cliffside road that demands care. By train, it is about 15 minutes by car from Toge Station on the JR Ou Main Line, with free pickup for overnight guests by reservation. A thirty-minute walk upstream leads to Namegawa Otaki, one of Japan's hundred finest waterfalls, at its best in the fresh green of late May and June and in the autumn colors of October.
Quality
Sulfur-containing - Sodium - Calcium - Bicarbonate - Sulfate Spring
Temp
40℃ to 53℃
Emerge
Natural Emergence
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 7
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 700JPY/Child 350JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 | 09:00 - 16:00 |
Quality
Radium Spring
炭酸カルシウム泉
Supply
Natural Source Flow
Use
Stay OK/Day Trip OK
Fee
Adult 1100JPY/Child 500JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 | 07:00 - 19:00 |
Book your stay
Nishiyama Onsen lies at the end of a long drive along the Hayakawa river, deep in the eastern foothills of the Southern Japanese Alps. The springs are said to have been opened around 705 AD in the Asuka period, giving this mountain hamlet more than thirteen centuries of bathing history. Motoyu Horaikan is one of the inns drawing on that ancient source, and it still preserves the room where Walter Weston, the British missionary who introduced the Japanese Alps to the wider world, stayed during his travels. There is almost nothing else here but the sound of the river and the steep forested slopes above it.
The water is a calcium-sodium sulfate-chloride spring, hypotonic and alkaline. It rises on its own without pumping, at a temperature that drifts between 34 and 38 degrees Celsius with the seasons, at pH 9.1 and a yield of 18.7 litres per minute. The water itself is clear and nearly odourless, but what has made Horaikan famous among hot spring enthusiasts is the mineral bloom it sometimes carries: unusually large flakes of golden to orange sediment, often compared to strips of tangerine peel. They appear unpredictably, which is precisely why devoted bathers keep coming back to look for them.
Bathing takes place in a single room with a full glass wall facing the gorge, where two indoor tubs sit side by side. One is gently warmed, the other is left exactly as the spring delivers it, close to body temperature and made for soaking without any sense of time passing. There is no open-air bath and no decorative flourish; the inn stakes everything on the quality of the water. The baths are mixed gender with separate changing rooms, and day visitors are sometimes offered separated or private slots instead. Parts of the building date from the early Meiji era, and self-catering rooms for extended therapeutic stays remain in use, so the atmosphere of an old toji village survives intact.
Day bathing runs from 10:00 to 15:00 at 1,000 yen for adults and 500 yen for children under school age; a 2,500 yen rate adds use of a rest room, which makes sense given how long the lukewarm water invites you to stay. Overnight stays cost roughly 10,000 to 17,000 yen with two meals built around wild mountain vegetables from the Hayakawa valley, while therapeutic stays start at 4,000 yen self-catering or 7,500 yen with meals. Access is about 45 minutes from Shimobe Onsen Hayakawa IC, or around 80 minutes by Hayakawa community bus from JR Minobu Station, with only four services a day. Early summer through autumn suits the cool water best, and winter brings the risk of icy roads. Closures are irregular, so always phone ahead before setting out.
Quality
Calcium - Sodium - Sulfate - Chloride Spring
Temp
34℃ to 38℃
Emerge
Natural Emergence
Supply
Natural Source Flow
Heat
Heated
pH
pH 9.1
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 1000JPY/Child 500JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 |
Book your stay
Yuya Onsen is a cluster of a few inns strung along the clear Ohora River on the western flank of Mount Ontake, a therapeutic bathing village said to have been opened more than 450 years ago. Gero City records it as a hot spring resort with over four centuries of history, and Edo-period documents already describe its water as medicinal. Okudaya is the original source inn of that village. The chronicle kept here, the Onsen Yumoto Kaigen Yuraiki, tells how a samurai named Magozaemon Okuda, ailing with a stomach complaint, found this water and recovered. The inn itself was founded some 360 years ago, and its ivy-covered wooden buildings make no attempt at glamour; they simply carry the accumulated weight of centuries as a place of cure.
The water is a carbon dioxide bearing sodium bicarbonate and chloride spring, and the numbers explain why it is so unusual. Total mineral content reaches 6,451 milligrams, of which free carbon dioxide alone accounts for 1,947 milligrams, placing it among the most strongly carbonated springs in Japan. It emerges at only 15.4 degrees Celsius, a genuine cold mineral spring. At the spout the water is clear and prickles on the tongue; as it settles in the tub it meets the air, turns a yellow brown, and throws down reddish flakes of mineral sediment. Because the source is cold, the inn raises the temperature through a heat exchanger, yet adds no water whatsoever. The baths run on undiluted spring water, with the inflow simply allowed to overflow. The spring also holds an official drinking permit, and a public fountain stands at the entrance where anyone may taste it. Its inclusion as one of Japan's finest drinking springs in Fuyuto Noguchi's book on drinking cures reflects that pedigree.
Bathing is confined to one indoor bath each for men and women, and there is no open-air tub. The men's bath, however, holds two pools side by side: one fed with the raw cold source, the other built of river stones and warmed by heat exchange. The cold pool keeps its dissolved carbon dioxide intact, and alternating slowly between the two leaves the body far warmer afterwards than a single hot soak would. The silky feel of the water at the spout is another signature of this place. All fifteen guest rooms are Japanese style, sleeping up to fifty, and look down on the river below. Dinner centers on Hida beef grilled with miso on a magnolia leaf and river char, along with soba milled, kneaded and boiled on the same day from buckwheat the owners grow themselves. At breakfast the rice porridge simmered in the carbonated spring water offers a way to take the spring in from the inside.
One practical point matters above all: this is not a day-trip bathhouse. Neither the official site nor the operator's own information page advertises day-use bathing, and the intended way to experience it is an overnight stay or a longer self-catering cure. Rates begin at 13,350 yen per person with two meals, or 5,430 yen per night for self-catering stays of three nights or more, with a shared kitchen that makes extended visits practical. Payment is cash only, credit cards are not accepted, and online booking is limited to parties of two or more, so solo travelers must reserve by telephone. The inn is open year-round with irregular closures. The surest approach is the JR Takayama Main Line to Hida-Osaka Station, where the inn will collect guests by prior arrangement; by car it is about 1 hour 30 minutes from the Nakatsugawa IC via Route 257. Nearby, the Gandate Gorge and the waterfall trails of Osaka offer scenery particular to the foothills of Mount Ontake, and finishing a day of walking by sinking into this carbonated cold water suits the place perfectly.
Quality
含二酸化炭素－ナトリウム－炭酸水素塩泉
含二酸化炭素－ナトリウム－塩化物泉
Supply
Natural Source Flow
Heat
Heated
Use
Stay OK/Day Trip N/A
Book your stay
Drive about ten minutes south from central Shirahama on Route 42 and the road opens onto Tsubaki, a quiet village facing the Pacific where hot water has drawn bathers for centuries. The Edo-period gazetteer Kii Zoku Fudoki described the spring as mild and soft, saying that bathing in it was like pouring oil over the body. Samurai of the Kishu domain and farmers from the surrounding villages came here to recover, though the first inn was not built until 1902. Ryokan Shirasagi opened in 1954 and has spent seven decades keeping that long-stay tradition alive.
The source, Horai-yu, is a simple sulphur spring that emerges at 31.9C. It ranks among the most strongly alkaline waters in western Japan; 9.9 is the figure usually quoted, though the inn's own site claims pH 10 or above and the Jun-Onsen Association recorded 9.8 during its inspection. The water is clear and colourless, and it feels distinctly slippery against the skin. Nothing is added to it and nothing is recirculated or filtered. Because the source is only in the low thirties, the main baths are warmed continuously, and that heating is the single intervention: the association certifies the men's and women's main tubs as Jun-Onsen C, meaning no dilution, no filtration, no disinfectant and no additives.
The bathing floor sits 60 metres above sea level, and the view bath looks straight out across the Pacific. Alongside one indoor bath for each sex there are rotating herbal baths, two on the men's side and three on the women's, filled with mugwort, aloe, loquat leaf, mandarin, yuzu, wood vinegar, seaweed or medicinal herbs depending on the day. Those tubs are left unheated at the source temperature of 31C, which is exactly the tepid, long-soak style that traditional cure bathing calls for. Meals lean on seafood from the nearby coast, with kamameshi rice pots and course dinners, and touches such as miso soup made with the spring water.
Rooms with two meals start around 8,800 yen. There are room-only, breakfast-included and half-board cure plans, plus a self-catering plan that is genuinely rare in the Kansai region: guests use a shared kitchen stocked with cookware and tableware and stay three to five nights or longer. Day visitors are welcome between 11:00 and 20:00, or until 14:00 when the inn is fully booked, for 700 yen per adult and 300 yen per child, with under-twos free. Closing days are irregular, so it is worth phoning ahead. The inn is about ten minutes from Nanki-Shirahama IC via Route 42, or 20 minutes by bus or taxi from JR Shirahama Station; free pickup from JR Tsubaki Station can be arranged when booking. Parking is free for 22 cars.
Quality
Simple Sulfur Spring
Supply
Natural Source Flow
Heat
Heated
pH
pH 9.9
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 700JPY/Child 300JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 | 11:00 - 20:00 |
Just twelve minutes by car from Kagoshima Airport, in the gorge carved by the Amori River, lies a healing spa called Myoken Onsen. Trace its origin and you arrive at a single inn: Tajima Honkan. In the closing years of the Edo period the founder, Jurouji Tajima, found hot water rising in his own rice paddy, and that discovery is the beginning of Myoken Onsen itself. The inn opened for guests in the Meiji era. In the roughly 170 years since, it has never remade itself as a sightseeing hotel; it remains a place for people who come for the water. An irori hearth greets you at the entrance, and down the corridor the self-catering wing is still in daily use. The inn is a certified stop on the Kyushu Onsen Trail, though the atmosphere is far plainer than any certificate would suggest.
The water is a bicarbonate spring, what the older Japanese classification calls a soda spring carrying earth minerals. It emerges at 47 degrees Celsius from the inn own sources and is piped straight into the tubs without reheating or recirculation, a design that limits how long the water sits exposed to air. Iron in the water turns it a cloudy brown and sets flakes of sediment drifting through the bath, closer in colour to mandarin peel than to rust. Lean close and there is a distinctly metallic smell; taste it and a faint salinity arrives with something almost broth-like behind it. Regulars insist you need no moisturiser after bathing here, and it is the line everyone reaches for when describing this water.
What defines Tajima Honkan is its three waters, each assigned to a different complaint. Shinkeitsu-no-yu, the most heavily mineralised with iron, is nicknamed the bath of the gods and is sought out for muscle pain, rheumatism and stiff shoulders. Kizu-yu holds a mild 41 degrees and is used for cuts, rough skin and eczema. Beside it, Icho-yu runs hotter at 43 degrees and has long been taken for digestive trouble. Together the locals call them the bath that lets you leave your walking stick behind, from the story of elderly bathers who forgot their canes and walked home unaided. There are no open-air baths and no private ones, simply two indoor tubs on each of the men and women sides. Showers exist only at Shinkeitsu-no-yu; at the other two you rinse under a cascading takase-yu spout. This is not the place to come for the comforts of a modern bath complex, but it is a clear answer to what an inn looks like when the water alone carries it.
Day bathing costs 300 yen for junior high school age and above, 150 yen for elementary school children, and nothing for under-sixes. Reception runs from 08:30 to 18:30 with the gate closing at 19:00. Note that the baths occupy two separate buildings and each costs 300 yen, so sampling all three waters means budgeting 600 yen. Bathing stops for cleaning between 11:00 and 13:00, alternating between Shinkeitsu-no-yu on Monday, Wednesday and Friday and the Kizu-yu and Icho-yu pair on Tuesday, Thursday and Saturday, so it is worth checking before you set out. Overnight stays start at 12,800 yen with two meals, with check-in from 13:00, and the self-catering wing makes a genuine long cure possible. There is no convenience store or supermarket within about ten minutes, so shop on the way if you intend to stay a while. Beyond the water, Wake-no-yu is a thirty-minute walk away, Inukai Falls forty minutes, and the century-old wooden station at Karekawa sits twenty minutes away by car.
Quality
Sodium - Calcium （ - Magnesium ） - Bicarbonate Spring
Temp
41℃ to 43℃
Supply
Natural Source Flow
Heat
Not Heated
Use
Stay OK/Day Trip OK
Fee
Adult 300JPY/Child 150JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 | 08:30 - 19:00 |
Nakashima Onsen Ryokan sits in the hamlet of Yunoura in Fukiage, Hioki City, Kagoshima Prefecture, barely five minutes by car from Fukiagehama, counted among the three great sand dunes of Japan. The spring here, once called Isaku Onsen and now known as Fukiage Onsen, is said to have been found around five hundred years ago by a farmer's horse. The lineage of this particular bath is unusually distinguished. It once served as the private spring of Shimazu Tadayoshi, better known by his honorific name Nisshinko, head of the Isaku branch of the powerful Shimazu clan. During his campaign against Kaseda he granted the spring to his retainer Kamata Kotaro in recognition of military service, and for generations afterwards it was called Kamata-don-no-yu. The Nakashima family later acquired it, and the inn is now in its fourth generation. Before the Meiji Restoration the springs of Isaku were ranked strictly by social class, and this one occupied the highest tier, reserved for the district magistrate. Records also show that Saigo Takamori bathed here in 1870, 1871 and 1874, and the statesman Komatsu Kiyokado noted a visit to Isaku Onsen in his diary.
The water is a sulfur spring, classified as hypotonic, alkaline and hot, with a pH of 8.9 and a source temperature of 50.1 degrees Celsius. What matters most here is that the spring rises within the grounds of the inn itself. The owners argue on their website that hot spring water begins to change within three days of emerging and loses its potency, so the only question that counts is how close to the source you are bathing. True to that principle, no boiler heats the water and nothing is added to it. Water hotter than fifty degrees runs straight from the ground into the baths and out again. The listed benefits cover neuralgia, muscle and joint pain, frozen shoulder, bruising, poor circulation and fatigue, together with chronic skin conditions, chronic gynaecological complaints, cuts and diabetes. The spring has a particular reputation for sensitive skin, and it was this reputation, so the story goes, that drew Saigo Takamori here.
The bathing is divided three ways. The main baths, one each for men and women, are open to day visitors and fill up with local regulars through the day. Saigo-don-no-yu, a stone bath renovated and named after the great man's visits, can be reserved privately by overnight guests. Nisshinko-no-yu, with both an indoor pool and an open-air section, belongs exclusively to whoever is staying in the detached annex, who may use it at any hour between check-in and check-out. The inn itself is equally distinctive. Built around a main house now more than seventy years old and thick with Showa-era atmosphere, it accepts only three parties a day, because each party is given three rooms: one for relaxing, one for dining and one for sleeping. The arrangement lets the staff stay out of the way. On the ground floor, three self-catering rooms preserve the atmosphere of the inn's earliest days as a curative bathing lodge, with cooking equipment lent free of charge. In the early Showa period, it is said, several hundred walking sticks were stored in the inn's warehouse, each left behind by a guest who had arrived in pain and departed without needing one.
Day-trip bathing runs generously from 6:00 in the morning until 21:00, at 380 yen for adults, 150 yen for primary school children and 80 yen for infants. The inn closes on the first, third and fifth Monday of each month, though this shifts when the day falls on a public holiday, and there is parking for thirty cars. Driving is the practical choice: roughly an hour from Kagoshima Airport, from JR Kagoshima-Chuo Station, or from Taniyama IC on the Kyushu Expressway. By public transport, take a Kagoshima Kotsu bus from JR Ijuin Station for about forty minutes to the Isaku stop, then a taxi for five minutes. The surroundings reward a longer stay. Fukiagehama, five minutes away, is a sweep of white sand and black pine listed among Japan's hundred finest shorelines. Senbongusu, also five minutes away, is a grove of camphor trees over eight hundred years old and protected as a municipal natural monument, while Onamuchi Shrine has drawn growing attention as a spiritual site. Shochu enthusiasts should allow time for the Nishi distillery ten minutes away and Komasa Jozo twenty minutes away. After a long soak in a spring this old, a day spent exploring southern Satsuma feels like the natural sequel.
Quality
Sulfur Spring
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 8.9
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 380JPY/Child 150JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 | 06:00 - 21:00 |
Deep in the hills of Satsumasendai in Kagoshima Prefecture sits a hot spring hamlet where the clock seems to have stopped half a century ago. Its name, Sendai-Taki Onsen, has nothing to do with the city of Sendai in northern Japan; this is a Satsuma cure village, and the characters are read differently. The spring is listed in the Kenkyu Zucho, a land register compiled in the Kamakura period, which means water has been rising here for some 800 years. In the Meiji era Saigo Takamori is said to have come repeatedly on rabbit hunts, soaking in the bath and playing go between outings. In 1990 the spring joined Japan's list of 100 Famous Hot Springs. Takeya Ryokan Honkan stands near the entrance to that hamlet.
The water is a simple sulfur spring. The posted analysis lists it as a blended source and records 52.1C at the wellhead, a pH of 9.2, and a total mineral content of 264.9 milligrams per kilogram. On paper that reads as a thin, unremarkable water. In the tub it is anything but. The clear water carries a faint sulfur note, and it clings to the skin with a slippery, almost soapy touch as the alkalinity gently lifts away surface oils. Bathers step out feeling smooth rather than stripped, which is why the locals have long called it a bijin-yu, a beauty bath. All the bathhouses in the hamlet share two sources and all of them run their tubs free-flowing. At Takeya Ryokan Honkan the water simply pours in and spills over the rim, never recirculated.
The bath is a half-sunken indoor room, separated by gender, lined with the kind of blue tile that has not been fashionable for decades. The tub is divided into two linked basins: the far side, next to the spout, runs hot, while the near side settles to something gentler. Soak on the near side if you dislike scalding water, or slide toward the spout when you want to sweat. The inn takes its role as a toji lodging seriously, with a shared kitchen stocked with tableware, a refrigerator, a stove, a microwave, a washing machine and a sink. Guests settle in for days or weeks, cooking their own meals between soaks, exactly as cure guests have done for generations. Room-only rates start at 3,850 yen, and rooms come with air conditioning, a television, and a kotatsu in winter.
Day-trip bathing runs from 7:30 to 20:20 and costs a remarkable 300 yen for adults and 150 yen for children. A 1,500 yen rest option including the bath lets you spend a whole day alternating between the water and a nap on the tatami. Overnight guests can bathe at any hour except during night cleaning from 20:30 to 2:00, which makes the first soak of the morning, in freshly filled water, the one to aim for. From JR Sendai Station the northern loop bus reaches the Takeya-mae stop in about 40 minutes and drops you at the door, though it runs only about four times a day. By car it is roughly 30 minutes from the station, with free parking for 30 vehicles. Day visitors are occasionally turned away when a group has booked the bath, so a quick phone call before setting out is worth the trouble.
Quality
Simple Sulfur Spring
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 9.2
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 300JPY/Child 150JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 | 07:30 - 20:20 |
Quality
Sodium - Bicarbonate Spring
Sodium - Bicarbonate - Chloride Spring
Temp
42℃ to 44℃
Supply
Natural Source Flow
pH
pH 7.2
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 500JPY/Child 300JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 | 11:00 - 14:00 |
Geto Onsen lies at the western edge of Kitakami City in Iwate Prefecture, deep in a gorge of the Geto River within the Ou Mountains. Said to have been discovered a thousand years ago, it was ranked Ozeki of the East in Edo-period hot spring rankings and long served travelers who came for extended cure stays. Geto Onsen Kanko Hotel stands at the entrance to this valley, just across Hakuen Bridge. Once a large lodge with both an inn wing and a self-catering wing, it closed for years until GETO Village Inc., founded by two people from the Tokyo area, took it over and reopened the doors on October 3, 2025, driven by a simple wish not to let the spring disappear.
The baths are pure free-flowing spring water, neither diluted nor reheated. Two sources feed the bathhouse. Hakuen-no-yu is a calcium-sodium sulfate spring emerging at 62.3 degrees Celsius at roughly 170 liters per minute, classified as a hypotonic, neutral, high-temperature spring. Hebi-no-yu is a sodium-calcium chloride spring that wells up naturally at 38.3 degrees Celsius with a pH of 6.4. The sulfate water settles softly on the skin, while the chloride water leaves a faint saltiness and lasting warmth after the bath. Being able to compare two distinctly different waters within the same bathhouse is this inn's particular luxury, and the thick mineral crusts around the spouts speak to centuries of steady flow.
Bathing takes place in gender-separated indoor baths that switch between men and women in the evening, so overnight guests can experience both rooms. The bathing hall holds several tubs, including a hot one and a milder pool at around 40 degrees that invites long soaking. Along the river sits Shintaro-no-yu, a calcium-sodium sulfate spring at 47.8 degrees Celsius and pH 6.8 that bubbles up through the floor of the tub itself, a rare form of bath found in only a handful of places in Japan. Together with the open-air bath, it was suspended for safety construction as of June 2026, and its return is eagerly awaited.
The inn now runs strictly as a self-catering cure lodge with no meals served. Rooms cost 8,800 yen on Sunday and Monday nights and 11,000 yen on Friday and Saturday, tax included and bathing tax extra, across twelve rooms. There is a simple cooking area, vending machines, and free Starlink Wi-Fi installed in 2026. No supermarket or convenience store exists nearby, so stock up on food in central Kitakami before heading up. Day bathing costs 800 yen for adults from 10:00 to 17:00 with last admission at 16:00, and the inn is closed Wednesdays and Thursdays. The critical caveat is winter: heavy snow shuts the access road and the inn from mid-November to early May. Aim for early summer, when the beech forest is brilliantly green, or for October, when the gorge turns to fiery autumn color.
Quality
Calcium - Sodium - Sulfate Spring
Sodium - Calcium - Chloride Spring
Temp
38℃ to 62℃
Emerge
Natural Emergence
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 6.8
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 800JPY/Child 400JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:00 - 17:00 | 10:00 - 17:00 | 10:00 - 17:00 | Closed | Closed | 10:00 - 17:00 | 10:00 - 17:00 | 10:00 - 17:00 | 10:00 - 17:00 |
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Nuruyu Onsen Ryokan Nikaido stands alone in the mountains at about 920 meters above sea level on the eastern foot of Azuma-Kofuji, roughly 18 kilometers west of central Fukushima City. The inn sits at the dead end of Prefectural Route 126, the old Nuruyu road, with no other houses nearby. Its spring is said to have flowed since the Kyoho era and has long been known as a remedy for eye ailments. The inn itself dates its beginning to 1803, when the Nikaido family acquired the rights to the spring and began receiving guests seeking a cure. The buildings were raised across the Meiji, Taisho and Showa periods, the oldest wing dating to around 1872, and three thatched-roof structures were listed as National Registered Tangible Cultural Properties in 2017. It is also a member of the Japan Association of Secluded Hot Spring Inns.
The analysis posted in the bathhouse describes the water as an acidic, iron-bearing aluminium sulfate spring, hypotonic, acidic and low in temperature, with a pH of 2.9 and a source temperature of 31.8 degrees Celsius. Alum-vitriol water of this kind is uncommon in Japan, and the flow is reported at about 194 liters per minute. What matters most is how the water is handled: it reaches the wooden tub entirely unheated, straight from the source, in a fully free-flowing supply. Clear and colorless with a faint metallic note, it sits close to body temperature, so there is no bracing shock when you lower your shoulders in. Its ranking as the eastern grand champion among Japan's lukewarm springs feels well earned.
Bathing is limited to separate indoor baths for men and women, with no open-air bath. Each bathhouse holds a wooden source tub for about six bathers alongside a small polyethylene tub for a final rinse, the latter clearly marked as plain hot water rather than spring water. So much water pours from the single pipe that it spills over the rim and spreads across the washing floor. Many guests soak for a full hour before warming up briefly in the heated rinse tub. Curiously, despite the mild temperature, the body stays warm from within long after the bath.
Inside, the inn feels suspended in the Showa era: corridors lined with paper screens, floorboards that creak underfoot, and tatami rooms furnished with a kotatsu and a stove. Guest rooms have no air conditioning, refrigerator or Wi-Fi, and toilets and washbasins are shared. Rates begin at 12,800 yen with two meals, with self-catering stays at 4,585 yen and long stays of five nights or more at 8,070 yen for those taking the traditional cure. Day-trip bathing is 700 yen for adults and 350 yen for children, from 9:00 to 17:00 with last admission at 16:00, and reservations are made by telephone or through the secluded-inn association. The drive takes about 40 minutes from Fukushima-Nishi IC, though the final three kilometers of Route 126 are narrow and sharply curved, so approaching by the wide farm road from the south side of Azuma Sports Park is the safer choice. Heavy snow limits the season to late April through late November, with the inn closed in winter, so plan a visit between the fresh green of spring and the autumn colors, and allow plenty of time.
Quality
Iron(II)-containing - Aluminum - Sulfate Spring
Temp
31℃ to 33℃
Emerge
Natural Emergence
Supply
Natural Source Flow
Heat
Not Heated
pH
pH 2.9
0714
AcidicNeutralAlkaline
Use
Stay OK/Day Trip OK
Fee
Adult 700JPY/Child 350JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 | 09:00 - 17:00 |
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Quality
Sodium - Bicarbonate Spring
Temp
42℃ to 44℃
Supply
Natural Source Flow
Use
Stay OK/Day Trip OK
Fee
Adult 700JPY/Child 400JPY
Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 | 10:00 - 15:00 |
Book your stay
Practical Notes for Visitors from Abroad
Booking: several of these cannot be booked online
This is the single biggest difference from a standard ryokan. Kuroyu no Takatomo Ryokan takes no bookings through online travel agencies, its telephone line is often unreachable, and its website no longer exists. Its spring is also running below strength, so only three baths — Kuroyu, Ramune and Hyotan — are usable, and it closes on irregular days. Several other inns here list rooms on Japanese-language booking sites only. If an inn matters to you, plan a fallback.
Seasons: some inns close for the winter
Ryokan Nikaido opens from late April to late November and shuts for the winter. The prefectural road up to it is narrow, partly unsurfaced and occasionally closed, and there is no bus and no pickup service — you drive yourself to 920 m. Takashige Ryokan sits in one of the snowiest districts in Japan, so check road conditions before a winter stay.
Payment: bring cash
Small inns of this kind frequently do not accept cards. Takatomo Ryokan states cash only. Assume the same at the others unless you have confirmed otherwise. Withdraw yen before you leave the city; convenience-store ATMs are scarce in these valleys. Day-trip bathing, where offered, runs roughly ¥300–¥1,100 for adults at the inns listed here — the exact figure is on each data page.
Mixed bathing (konyoku)
Some of the signature baths here are mixed. Osawa Onsen's large riverside open-air bath Osawa no Yu is mixed, with a separate women-only open-air bath, Kawabe no Yu. Takatomo Ryokan's Kuroyu is a mixed hall. Ryokan Ohnuma's Yakushi Sennin-buro is mixed but sets women-only hours. Ohnuma also has five private baths that can be used free of charge without reservation, which is the simplest option if you would rather bathe alone. None of these inns publishes a swimwear policy; Japanese hot spring baths are normally entered unclothed, so plan on that and pick an inn with a private bath if it matters to you.
Tattoos
None of these inns publishes a tattoo policy in the data we hold, so no general rule can be given. Small toji inns tend to be more relaxed than large resort hotels, but the practical answer is to ask when you book, and to prefer inns with private or family baths if you would rather not test it.
Getting there without a car
More of these are reachable without a car than you might expect. The three Higashi-Naruko inns are a 3–5 minute walk from Naruko-Goten'yu station on the JR Rikuu East Line, which makes them the easiest entry point to toji for anyone travelling by rail. Sukayu is reachable by bus from Aomori city, and Osawa Onsen by bus from Hanamaki.
Several more are served by local buses. Yamada Ryokan is 35 minutes on the village bus from Minami-Otari station on the JR Oito Line (¥700), and the stop is at the door. Takeya Ryokan is 40 minutes on the Satsumasendai city loop bus from JR Sendai station, a flat ¥150. Wakamatsuya Murai Rokusuke is 55 minutes by Okura village bus from JR Shinjo station (¥600). Horaikan is 80 minutes by Hayakawa community bus from Minobu station (¥1,500), but there are only four services a day.
Where there is no bus there is often a taxi or a pickup. Futamata is about 30 minutes by taxi from JR Oshamambe station, and runs a shuttle for overnight guests who reserve it. Namegawa Onsen collects overnight guests from Toge station on the JR Ou Line free of charge. Mogamiya Ryokan is about 15 minutes by taxi from Shiroishi-Zao shinkansen station.
Only Nuruyu genuinely requires your own car. There is no bus and no pickup, and the approach road is narrow and partly unsurfaced.
Where the Inns Cluster
Thirteen of the 21 are in the six northeastern prefectures, strung along the Hakkoda, Hachimantai, Azuma, Zao and Kurikoma volcanic belts. Three are in the single hamlet of Higashi-Naruko, which held a goten-yu — a bath house reserved for the Date lords — in the Edo period and has stayed a quiet self-catering village since. For a wider view of the region, see the guide to the hidden hot springs of Tohoku.
https://www.tan-ken.com/en/blog/dp0ubfgjgk
Three more are in Kagoshima. Tajima Honkan is the founding inn of Myoken Onsen, begun when Tajima Jurojiro found the spring welling up in a paddy field in the late Edo period, and it has never converted itself into a resort hotel. Sendai-Taki Onsen appears in a Kamakura-period land register, and Saigo Takamori stayed there repeatedly in the Meiji era. Fukiage's Nakashima Onsen Ryokan inherited a bath once reserved for the Isaku branch of the Shimazu clan, in a village where baths were formerly graded by rank. The rest of Kagoshima's hidden springs are covered separately.
https://www.tan-ken.com/en/blog/2v__hzci7
The Yamagata and Miyagi inns above also appear in the prefectural guides.
https://www.tan-ken.com/en/blog/ds2y_mqv3
https://www.tan-ken.com/en/blog/bsjx4i18djjd
For hidden hot springs generally, beyond toji, start with the three great hidden onsen of Japan.
https://www.tan-ken.com/en/blog/j5hf5xrd1sp
Choosing by Length of Stay
Two or three nights, as a first try. Take the train. The three Higashi-Naruko inns are minutes from the station and share a yumeguri ticket for neighbouring baths. Osawa Onsen and Sukayu are both reachable by bus.
Five nights or more. Choose an inn with an explicit long-stay plan. Ryokan Nikaido prices stays of five nights and over separately; Horaikan takes toji guests both self-catering and with meals; Tamagawa and Goshogake both run a distinct toji wing and still draw long-stay regulars.
Winter. Mountain inns close. Nuruyu shuts in late November, and the road to Takashige Ryokan needs checking in deep snow. For a long winter soak, the three Kagoshima inns and Tsubaki Onsen in Wakayama sit at low elevation and stay open.
Kitchen facilities, long-stay pricing and booking methods differ sharply from inn to inn. Check water type, pH, source temperature and free-flow status on each data page, and confirm opening season and reservation method with the inn itself.
Frequently Asked Questions
Q. How many nights counts as toji?
There is no official threshold. Inns draw the line themselves: Ryokan Nikaido prices stays of five nights and over as a long stay. Self-catering wings will usually take a single night, and the cost per night tends to fall as the stay lengthens. Check current rates with each inn.
Q. What is the difference between the toji wing and the ryokan wing?
Buildings and pricing, mostly. At Ryokan Ohnuma the main building is the ryokan side, sold with dinner and breakfast, while the toji building is sold room-only or with kitchen access. Sukayu splits the same way, between a Showa-era ryokan wing and a plain toji wing for self-catering and long stays. The water is normally the same in both.
Q. Do I need to bring cooking equipment?
It depends on the inn. Nakashima Onsen Ryokan lends cooking equipment free. Takeya Ryokan Honkan's shared kitchen has tableware, a refrigerator, a stove and a microwave. Geto Onsen Kanko Hotel provides only a simple cooking area. Ask at the time of booking, and also ask where the nearest food shop is.
Q. Is the water free-flowing at all 21?
All 21 use gensen kakenagashi or a close equivalent, but the detail differs. Osawa Onsen Jisuibu Tojiya runs partly recirculated. Okudaya and Horaikan heat their low-temperature sources but add no water. Each data page states whether the bath is heated, diluted, recirculated or chlorinated.
Q. Can I visit for the day instead of staying?
At most of them, yes — 19 of the 21 accept day bathers. Hijiori Wakamatsuya Murai Rokusuke and Yuya Onsen Okudaya take overnight guests only. Hours change seasonally, so check the data page and the inn's own information before travelling.
Disclaimer
- Information in this article (admission fees, opening hours, water analysis data, opening seasons) reflects the time of research. Errors and changes are possible. Please confirm current details with each facility's official website or the local tourist association.
- Indications listed for hot spring water under Japanese regulation are not claims of treatment or cure. If you have a medical condition or are pregnant, consult a doctor before a long course of bathing.
