Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Yoshimatsu Ekimae Onsen, near Yoshimatsu Station in Yusui, Kagoshima, heats its sulfurous water to 42°C. An indoor bath, an outdoor rotenburo bath and a sauna are on offer.
Insider tip — Yoshimatsu Ekimae Onsen, the station-front spring of a town literally named for its hot waters (Yusui = hot water spring), preserves the era when railway stations anchored community life in rural Kyushu. Yusui Town sits on the volcanic plateau at the base of the Kirishima mountains where geothermal heat rises through the same magmatic system that created the ancient Aira Caldera — the enormous supervolcanic crater beneath which modern Kagoshima City was built.