Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Shugyoku no Yu Yakushido Onsen, in the city of Ōshū, Iwate, offers sodium-chloride water at 41°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Yakushido Onsen serves the southern plains of Ōshū City — formerly known as Mizusawa — the birthplace of Masamune Date (1567-1636), the most powerful daimyo of the Tohoku region, whose ambitions very nearly matched those of Tokugawa Ieyasu in the final Sengoku settlement. Ōshū is also home to Japan Space Agency tracking facilities and preserves the heritage of the Fujiwara clan whose 12th-century Northern Fujiwara kingdom built the golden Konjikido chapel at Hiraizumi — a UNESCO World Heritage site just north of the city.