Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Tokiwaso, at Handeri Onsen in the highland village of Tsumagoi, Gunma Prefecture, heats thermal sulfurous water to 42°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — 'Tokiwaso' (evergreen lodge) at Handeri Onsen in Tsumagoi, a mountain village famous for its cabbage fields and the alpine road to Shiga Kogen. Tsumagoi's volcanic proximity means consistently sulfurous, high-quality hot spring waters. The lodge-style setting is perfect for a quiet mountain stay.