Takamagahara Onsen
Hot Spring Overview
Kōtengahara Onsen is a hot spring situated at about 2,100 m elevation in Kurobedaniwari, Arimine, Toyama City—north of the Kōtengahara Wetland at the foot of Mt. Suishō in the Northern Alps. Nicknamed “Japan’s most remote onsen,” its name conjures a mythic realm, inspired by the breathtaking scenery.
The spring is a simple sulfur spring (hydrogen sulfide type), and its milky-blue water is opaque and beautiful. There are three open‐air baths—men’s, women’s, and mixed—and the water temperature is around 42 °C. Guests staying at Kōtengahara Sansō may bathe free of charge; day‐trippers pay ¥300.
About Secluded Rating
Total Score
超秘湯
Access
Scenery
Value
Called “Japan’s most distant onsen” for its extremely challenging access (1 night/2 days for veterans, 3 nights/4 days for most), at an altitude of about 2,100 m and reachable only by mountaineering, it perfectly meets a Level 5 secrecy rating. Immersed in the grandeur of the Northern Alps and under a canopy of stars, it offers an adventure unlike any other.
Hot Spring Details
| Quality | 硫黄泉 |
| Temp | ---℃ ～ 51℃ |
| Flow | Natural Source Flow |
| pH | pH 6.2  0714 AcidicNeutralAlkaline |
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Temperature
Flow Type
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Practical Info
| Stay | OK | ||||||||||||||||||
| Day Trip | OK | ||||||||||||||||||
| Fee | Adult 300JPY/Child ---JPY | ||||||||||||||||||
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Stay/Day Trip
Stay
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Day Trip
Day Use
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Business Hours
| Mon | Tue | Wed | Thu | Fri | Sat | Sun | Hol | |
|---|---|---|---|---|---|---|---|---|
| 00:00 - 24:00 | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ | ◯ |
Booking
Visit Log
Bath Types
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Access Information
From Toyama Chihō Railway’s Arimine-guchi Station, take the summer‐season bus to Oritate (about 1 hour). Even from this nearest trailhead, it’s roughly a 13-hour trek. The only way to reach the onsen is on foot: from Toyama Prefecture’s Oritate trailhead via Tarōdaira Hut and Yakushisawa Hut, or from Gifu Prefecture’s Shin-Hotaka Onsen via Kagami-daira Mountain Hut and Suga-rokugoya Hut. Even experienced hikers need 1 night and 2 days; for most, it’s a 3-night, 4-day expedition.
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