Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Nango Onsen Shakunage no Yu, in the town of Nasu, Tochigi Prefecture, offers sulfurous water at 44°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Nango Onsen Shakunage no Yu sits in the mountain interior of Tochigi Prefecture, an area where volcanic ridges feed powerful sulfurous springs used by locals for generations. The hot water at 44°C carries a sharp mineral scent and a silky texture that relieves muscular fatigue from hiking the surrounding highland trails. Shakunage means rhododendron, and the gardens bloom extravagantly each May, drawing photographers alongside bathers. A small outdoor rotenburo allows guests to soak beneath cedar canopies while listening to the mountain stream below.