Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Tamatsukuri Onsen Yu-yu is located in Tamatsukuri, Shimane prefecture, one of Japan's oldest hot spring sites. Bicarbonate water with a pH of 8 reaches 44°C between an indoor bath and a rotenburo, with a sauna.
Insider tip — Tamatsukuri Onsen is one of Japan most ancient hot springs, praised in the 8th-century Man'yoshu anthology for its skin-beautifying properties. The alkaline bicarbonate water is celebrated as bijin no yu, the beauty spring, and reputedly repairs the skin in a single soak.