Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Kamiyama Onsen is located in Kamiyama, Tokushima Prefecture, on the island of Shikoku. The bicarbonate thermal water has a pH of 8 at a temperature of 40°C (104°F). An indoor bath, an outdoor rotenburo bath and a sauna are available.
Insider tip — Kamiyama-cho has quietly become Japan's most talked-about rural revival: satellite offices for tech firms, international artists-in-residence, and creative entrepreneurs have transformed this cedar-forested valley town into a model for regional regeneration. The onsen here offers the perfect analog counterbalance — step away from the laptop into a silky bicarbonate bath, rinse off in the cool Akui River air, and feel exactly why people choose to live and work here.