Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Also in Gero, Gifu, the Shiei Rotenburo of Nigorigo Onsen relies on bicarbonate water at 40°C. The facility includes an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Shiei Rotenburo at Nigorigo Onsen, the turbid-water spring, serves the mountain valley above Gero City where the bicarbonate spring emerges slightly clouded by dissolved minerals — a characteristic turbidity that gives Nigorigo its descriptive name and distinguishes it from the clearer springs of the Gero resort below. The Nigorigo valley is one of the most remote accessible onsen locations in the Hida highlands, and the outdoor rotenburo immersed in cedar forest beside a mountain stream represents the quintessential Japanese ideal of wild mountain bathing in its most pristine form.