Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Oisawa Onsen Yuttari Kan, in Nishikawa, Yamagata Prefecture, uses sulfurous water at 44°C. An indoor bath, outdoor rotenburo and sauna make up this bathhouse's facilities.
Insider tip — Oisawa Yuttari Kan, the leisurely relaxation hall at Oisawa, stands high in the Nishikawa mountain zone where Gassan ski resort offers Japan longest ski season, with snow lasting well into summer on the ancient moraine fields. The sulfurous spring is a beloved après-ski tradition for skiers who make the pilgrimage from across Japan.