Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Asu no Yu Onsen, located in Sendai, Miyagi Prefecture, has sodium-chloride water at 41°C. The facility includes an indoor bath, an outdoor rotenburo, and a sauna.
Insider tip — Asu no Yu, the Tomorrow Hot Spring, expresses hopeful renewal at the edge of the great city of Date Masamune, the one-eyed dragon lord who built Sendai in 1601 as the most sophisticated regional capital in eastern Japan. Today Sendai is the metropolis of Tohoku, celebrated for the Tanabata star festival whose paper decorations fill the arcade streets each August, and for the distinctive gyutan beef tongue cuisine that defines the city culinary identity.