Best Iron Spring Hot Springs Ranking
16 hot springs
Iron springs are rich in iron content. The water is colorless when it first emerges but turns amber as the iron oxidizes upon contact with air. It has long been known as 'the women's bath.'
The iron content is believed to help with mild anemia. It also offers strong heat retention, which may help with cold sensitivity.
Ranking Criteria
Koakazawa Hot Spring Rakuyokan
Iron(II)-containing - Calcium （ - Magnesium ） - Sodium - Bicarbonate - Chloride Spring
Doroyu hot spring
Simple Hot Spring / Simple Sulfur Spring / Acidic - Iron(II) - Sulfate Spring
Tsukahara Onsen Kako-no-Izumi
Acidic - Iron(II) - Sulfate Spring / Iron(II)-containing - Aluminum - Sulfate Spring
Natural Carbonated Hot Spring Nomon-yu
含鉄・二酸化炭素－カルシウム－炭酸水素塩泉
Washikura Onsen Kogen Ryokan
Simple Sulfur Spring / Acidic - Iron(II) - Sulfate Spring
Yawatahama Kuroyu Onsen Minato-yu
Iron(II)-containing - Sodium - Bicarbonate Spring
Fuigo Onsen
Acidic - Copper-containing - Iron(II) - Sulfate Spring
Dokusawa Kosen Kaminoyu
Iron(II)-containing - Aluminum - Sulfate Spring
Gohoku Musasabi Onsen
Iron(II)-containing - Sodium - Chloride （ - Bicarbonate ） Spring
Iwojima Higashi Onsen
Acidic - Sulfur-containing - （ Sodium ） - Sulfate Spring (Hydrogen Sulfide Type) / Aluminum - Iron(II) - Sulfate Spring
Akigami Onsen Ryokan
Iron(II)-containing - Calcium （ - Magnesium ） - Bicarbonate Spring
Aoki Kosen
単純鉄泉（硫酸塩型）
Yunoami Onsen Shikanoyu Matsuya
Iron(II)-containing - Sodium - Bicarbonate - Chloride Spring
Nuruyu Onsen Ryokan Nikaido
Iron(II)-containing - Aluminum - Sulfate Spring
Sugatani Onsen
Iron(II)-containing - Calcium （ - Magnesium ） - Bicarbonate Spring
Takarabune Onsen Yumoto Kotobuki
単純鉄（Ⅱ）泉（炭酸水素塩型）
Comparison of Ranked Hot Springs
| Name | Prefecture | Water Quality | Source-fed | Onsen Value |
|---|---|---|---|---|
| Koakazawa Hot Spring Rakuyokan | Nagano | Iron(II)-containing - Calcium （ - Magnesium ） - Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | 4 |
| Doroyu hot spring | Akita | Simple Hot Spring, Simple Sulfur Spring, Acidic - Iron(II) - Sulfate Spring | Natural Source Flow | 4 |
| Tsukahara Onsen Kako-no-Izumi | Oita | Acidic - Iron(II) - Sulfate Spring, Iron(II)-containing - Aluminum - Sulfate Spring | Natural Source Flow | 3 |
| Natural Carbonated Hot Spring Nomon-yu | Nagasaki | 含鉄・二酸化炭素－カルシウム－炭酸水素塩泉 | Natural Source Flow | 3 |
| Washikura Onsen Kogen Ryokan | Fukushima | Simple Sulfur Spring, Acidic - Iron(II) - Sulfate Spring | Natural Source Flow | 3 |
| Yawatahama Kuroyu Onsen Minato-yu | Ehime | Iron(II)-containing - Sodium - Bicarbonate Spring | Natural Source Flow | 3 |
| Fuigo Onsen | Tokushima | Acidic - Copper-containing - Iron(II) - Sulfate Spring | Natural Source Flow | 3 |
| Dokusawa Kosen Kaminoyu | Nagano | Iron(II)-containing - Aluminum - Sulfate Spring | Partial Natural Flow | - |
| Gohoku Musasabi Onsen | Kochi | Iron(II)-containing - Sodium - Chloride （ - Bicarbonate ） Spring | - | - |
| Iwojima Higashi Onsen | Kagoshima | Acidic - Sulfur-containing - （ Sodium ） - Sulfate Spring (Hydrogen Sulfide Type), Aluminum - Iron(II) - Sulfate Spring | Natural Source Flow | - |
| Akigami Onsen Ryokan | Gifu | Iron(II)-containing - Calcium （ - Magnesium ） - Bicarbonate Spring | - | - |
| Aoki Kosen | Yamanashi | 単純鉄泉（硫酸塩型） | - | - |
| Yunoami Onsen Shikanoyu Matsuya | Ibaraki | Iron(II)-containing - Sodium - Bicarbonate - Chloride Spring | Natural Source Flow | - |
| Nuruyu Onsen Ryokan Nikaido | Fukushima | Iron(II)-containing - Aluminum - Sulfate Spring | Natural Source Flow | - |
| Sugatani Onsen | Shiga | Iron(II)-containing - Calcium （ - Magnesium ） - Bicarbonate Spring | Natural Source Flow | - |
| Takarabune Onsen Yumoto Kotobuki | Shiga | 単純鉄（Ⅱ）泉（炭酸水素塩型） | Partial Natural Flow | - |
Frequently Asked Questions
Q.Why does iron spring water turn amber-colored?
A.The water is colorless when it first emerges, but the iron it contains oxidizes upon contact with air, turning the water amber.
Q.Why is the iron spring called 'the women's bath'?
A.Because the iron content is believed to help with mild anemia, it has long been considered well-suited for women.
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