Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Caldera Onsenkan is located in Ōkura, Yamagata Prefecture. Its sulfurous water rises at 44°C and serves an indoor bath, an outdoor rotenburo pool and a sauna.
Insider tip — Caldera Onsenkan takes its name from the ancient volcanic caldera landscape of the Ou Mountains where Ōkura Village preserves the last communities of ancestral matagi bear-hunters who have followed their prey through the beech forests since the Heian period. The village is also famous for Oguni sugi cedar, one of Japan finest timber varieties whose long straight grain is quarried from the mountain slopes that ring this remote Yamagata highland community.