Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Omitama Onsen Yu-Go!, in Omitama, Ibaraki prefecture, offers sodium-chloride water at 41°C across an indoor bath and an outdoor rotenburo, with a sauna.
Insider tip — Omitama — a city whose very name means precious/honorable sphere — is in the flat agricultural Ibaraki plain between the Kashima athletic facilities and the Tsukuba science city; Yu-Go! onsen channels the energetic spirit of its exclamation-point name into enthusiastic sodium-chloride bathing drawn from deep Kanto basin marine sediments where dark kuro-yu (black water) may be expected.