Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Setoohashi Onsen Yamasachi, in Kurashiki, Okayama Prefecture, facing the Seto Inland Sea, offers sodium-chloride water at 41°C, an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Setoohashi Onsen Yamasachi draws saline spring water from the hills above the Seto Inland Sea near Kurashiki, a city celebrated for its preserved Edo-period canal district and Ohara Museum of Art. The thermal water at Yamasachi is rich in sodium chloride drawn from ancient seawater trapped in sedimentary layers beneath the coastal mountains. Outdoor baths offer views toward the Seto Ohashi bridge connecting Honshu and Shikoku, and the salty mineral water is especially valued for moisturizing sun-exposed skin after visits to the nearby beaches. Sunset bathing with the bridge lights emerging is a particularly memorable experience.