Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Hachimantai Onsenkan Mori no Yu, in Hachimantai, Iwate Prefecture, heats sulfurous water to 44°C. The bathhouse offers an indoor bath, rotenburo and sauna.
Insider tip — Mori no Yu, the forest spring, draws from the volcanic Hachimantai highland where the borders of Akita and Iwate meet in a plateau of geothermal craters, alpine wetlands, and snow-dusted beech forest. The sulfurous spring water has the milky blue-white appearance typical of active volcanic discharge in this extraordinary landscape.