Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Azuma Onsen Kikyokan is a hot-spring facility in Higashiagatsuma, in the mountains of Gunma Prefecture. Its sulfurous water reaches 44°C, offered in an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Kikyokan, named for the bellflower, sits in the volcanic Agatsuma Gorge corridor of Gunma. The sulfurous spring offers an invigorating and soothing soak; arrive early as outdoor rotenburo fill quickly in autumn foliage season.