Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Kaimi Onsen, housed within the Nishikawa-machi welfare center for the elderly (Yamagata Prefecture), offers sulfurous water at 43°C, with an indoor bath, a rotenburo and a sauna.
Insider tip — Nishikawa-machi nestles at the foot of Gassan, the Moon Mountain, second of the three sacred Dewa Sanzan peaks where Buddhist mountain ascetics have trained since the 7th century. The elder welfare centre spring serves a community shaped by this ancient spiritual landscape, where pilgrims in white still climb through deep summer snow.