Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Kaminokawa Onsen is a hot spring bathhouse located in Kagoshima, in southern Japan. Its sulfurous water reaches 44°C and feeds an indoor bath as well as an outdoor rotenburo, with a sauna.
Insider tip — Kaminokawa Onsen sits in the western suburbs of Kagoshima, closer to the Kirishima volcanic range. The name upper-river onsen suggests a spring source in the hills above the city — the water has a particularly deep mineral character.