Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
Niseko Yakushi Onsen in Rankoshi, Isoya County, Hokkaido holds the extraordinary distinction of being one of Japan's Three Great Hidden Hot Springs, a designation that reflects both its exceptional remoteness and the remarkable quality of its thermal waters, which well directly through the floor of the bathing pool itself. This exceptional geological feature — where the bathtub is simultaneously the spring source — creates an unmediated, primal connection between bather and the earth's geothermal energy that is vanishingly rare even among Japan's many thousands of documented onsen. The spring's legendary status as one of the great hidden hot springs of Japan and its singular geological configuration have made Niseko Yakushi Onsen an object of devoted pilgrimage for the most serious enthusiasts of Japanese thermal bathing culture.
Insider tip — Niseko Yakushi Onsen is the smallest and most secluded of the Niseko spring villages, named after the Yakushi Buddha of healing waters. The volcanic sulfurous spring flows freely into a modest public bath that is popular with local farmers and off-piste skiers who know its location. The setting among rice paddies and forest gives a rural tranquility absent from the better-known Niseko resorts. A long evening soak here under a star-filled Hokkaido sky is an experience that lingers in the memory.