Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
In Maruseppu, part of Engaru on Hokkaido, Maruseppu Onsen Yamabiko taps a sodium-chloride spring at 41°C, pH 7.3. On site: an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — In the remote Maruseppu settlement of Engaru in Monbetsu District, where Hokkaido's forested Kitami mountains meet the Okhotsk coast, Yamabiko (mountain echo) onsen resonates through the cedar and birch forests with the quiet energy of deep rural Hokkaido; the area's pristine rivers, salmon runs, and brown bear habitat make this a genuine wilderness spa destination.