Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Kunimi Onsen Choei (Kunimi Sanso), in Shizukuishi, Iwate Prefecture, uses sulfurous water at 44°C, with an indoor bath, outdoor rotenburo and sauna.
Insider tip — Kunimi Sanso, the mountain lodge with a view of the country, overlooks Shizukuishi from the volcanic ridgeline where the Amihari and Koiwai ranch landscapes roll toward Iwate Komaga-take and Mount Iwate. The sulfurous spring here carries the volcanic signature of the great Tohoku arc that stretches from Zao to Hachimantai.