Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
In Miyoshi, Tokushima Prefecture, Miyoshi-shi Fureai Koyo Center Koyo Onsen draws sodium-chloride thermal water reaching 39°C. The facility combines an indoor bath, an outdoor bath (rotenburo) and a sauna in a setting built for relaxation.
Insider tip — 'Koyo Onsen' (autumn foliage spring) at the Miyoshi City Fureai Koyo Center. Miyoshi is the gateway to the mystical Iya Valley — Japan's most isolated inhabited gorge, known for its swinging kazurabashi vine bridges and 'Japanese Tibet' character. The autumn foliage of Iya's mountains is legendary; this community onsen warms visitors before and after.