Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
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Dense, salty water — you float without effort.
SodiumChloruresBrome
This Tennen Onsen (Ashibe Tonden) sits in the Tonden district of Sapporo, Hokkaido island. The natural sodium-chloride water reaches 41°C, shared between an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — In Tonden, the northern Sapporo district named after the Meiji-era tonden-hei (farmer-soldiers) who pioneered Hokkaido's development, Ashibe Tonden draws natural sodium-chloride spring water from deep beneath the Ishikari Plain; the facility preserves the pioneer spirit of communal bath culture in Japan's fastest-modernizing city.