Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Kasumi Yatagawa Onsen, in Kasumi, Hyogo Prefecture, taps iron-rich water at 40°C. An indoor bath, an outdoor rotenburo, and a sauna make up this bathhouse on the Sea of Japan coast.
Insider tip — Kasumi Yatagawa Onsen sits in the Yatagawa valley of Hyogo's San-in Coast National Park, offering iron-laden waters that impart a warm amber tint to the pools. The spring is a local secret among onsen connoisseurs, far less crowded than resort destinations along the coast. Pair your visit with a fresh crab dinner at a nearby minshuku for a quintessential northern Hyogo experience.