Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Fukasawa Onsen is also located in Shōwa, Yamanashi. Its bicarbonate water at 40°C, pH 8, supplies an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Fukasawa, the deep marsh spring, draws on the aquifer fed by Southern Alps snowmelt percolating through layers of alluvial gravel beneath the Kofu basin. The Showa area of Yamanashi is ringed by the giants of Japanese alpinism — Kitadake, Ainodake, and Notori — whose snow-capped peaks are visible on clear days.