Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Saburigawa Onsen Yamabiko Kaikan, in Ōi, Fukui Prefecture, taps sodium-chloride water at 41°C. An indoor bath, an outdoor rotenburo, and a sauna are available to visitors.
Insider tip — Yamabiko Kaikan, the mountain echo hall, takes its name from the yamabiko spirit of Japanese folklore said to inhabit deep mountain valleys and return your calls as an echo. Ōi-machi on the Wakasa Bay coast is home to the Ōi Nuclear Power Plant surrounded by dramatic peninsula scenery, and the Saburi River valley above the town preserves traditional forestry communities insulated from the coastal industrial world below.