Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Wakihama Onsen Yokujo is located in Unzen, Nagasaki Prefecture. Its sulfurous water is heated to 44°C and feeds an indoor bath as well as an outdoor rotenburo, with a sauna.
Insider tip — Unzen is Kyushu's most dramatically volcanic spa town, its hells (jigoku) boiling at 120°C and visible from every corner. Wakihama Onsen Yokujo is a community bath drawing this same geological power at a temperature that allows actual soaking.