Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Kusukawa Onsen is located in Minamikyushu, Kagoshima Prefecture, southern Japan. Its iron-rich water, with an acidic pH of 6.3, emerges at 42°C (108°F). An indoor bath, an outdoor rotenburo bath and a sauna are available.
Insider tip — Kusukawa Onsen sits close to the volcanic southern tip of Kyushu in Kagoshima Prefecture, where iron-laden waters tint the tub a warm amber-brown. The ferruginous minerals are prized for improving circulation and easing joint pain. The rural setting offers views of tea plantations that carpet the hillsides around Minamikyushu. Arrive at dusk when the mist rolls in for an almost otherworldly atmosphere.