Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Otainai Onsen (Kenko Center), in Gotenba, Shizuoka prefecture, draws sodium-chloride water at 41°C. An indoor bath, an outdoor rotenburo and a sauna are available.
Insider tip — In Gotenba at the base of Mount Fuji, where the most-climbed mountain on earth towers over factory outlet stores and JSDF training grounds, Otainai Kenko Center offers mineral bathing with the world's most iconic peak as backdrop; Gotenba's famous outlet mall draws shoppers from across Asia, making this community health onsen a tranquil counterpoint to the commercial energy at Fuji's foot.