Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Koge Onsen, in the forested hills of Yazu district in Tottori Prefecture on the Sea of Japan coast, draws on bicarbonate thermal waters in the quiet San'in region — one of Honshu's least-visited and most historically layered coastal areas, where ancient Shinto traditions, paper-making heritage, and the dramatic Tottori Sand Dunes combine with a deeply traditional onsen culture. The naturally mineralised bicarbonate waters are used in the classic Japanese therapeutic bathing tradition, offering skin-softening alkaline properties particularly valued in the region's cooler Sea of Japan climate where winter winds and heavy snowfall make warming onsen especially prized. Tottori Prefecture's extraordinary combination of the San'in Geopark, Kurayoshi's preserved whitewashed storehouses, and the mysterious Mitoku-san wooden temple clinging to a cliff face make Koge Onsen a culturally rich spa destination in one of Japan's most authentically unhurried regions.