Koumi Onsen

Koumi Onsen is located in Koumi Town, Nagano Prefecture, on the Koumi highland plateau at over 1,100 meters elevation near Japan's geographic center, where the crystal-clear air of the Yatsugatake foothill basin, the scenic Chikuma River headwaters, and the surrounding mountain scenery create an exceptional high-altitude spa environment. The siliceous thermal waters here serve a town that is part of the scenic Koumi Line railway route — one of Japan's most celebrated scenic railways, offering spectacular views of the Yatsugatake volcanic range and Mount Fuji on clear days — making Koumi Onsen part of a memorable mountain railway and spa combination unique to this central Nagano highland. These hot springs provide therapeutic mineral bathing at altitude, where the combination of thin clean mountain air, dramatic volcanic scenery, and siliceous mineral waters creates a restorative environment of rare quality in the heart of the Japanese Alps corridor.