Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Sounkyo Onsen Grand Hotel is set deep within the dramatic basalt gorge of Sounkyo in the Daisetsuzan National Park — Japan's largest national park encompassing the vast volcanic interior of Hokkaido — where sheer volcanic cliffs rising 150 meters, seasonal waterfalls of extraordinary power, and autumn foliage of intense crimson and gold surround the secluded onsen village. Chloride-rich hot spring water from volcanic sources beneath the Daisetsuzan massif fills the grand hotel's indoor and outdoor rotenburo baths, offering the rare experience of soaking within one of Japan's most awe-inspiring volcanic canyon landscapes far from any urban center. The gorge is famous for two spectacular waterfalls — Ryusei (Shooting Star) and Ginga (Milky Way) — visible from hiking trails that begin directly from the onsen village and lead into the untouched wilderness of the volcanic interior where brown bears and red foxes roam. With its dramatic scenery, isolation, and the raw power of Daisetsuzan's volcanic peaks, Sounkyo Onsen represents the quintessential northern Japan onsen experience — surrounded by wild nature, immersed in mineralized volcanic warmth, far from civilization.