Gake no Yu Onsen
- Location
- Saku, Nagano, Japan
- Water type
- thermal
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Gake no Yu Onsen takes its evocative name from the Japanese words for cliff and hot water, conjuring the image of a thermal spring emerging directly from rocky outcroppings or steep valley walls, a distinctive geological configuration found throughout Japan's mountainous volcanic landscape. This type of cliff-side spring carries a long tradition of use by mountain travelers and woodsmen in Japan, representing the untamed, elemental side of the country's rich onsen heritage where the earth's geothermal energy surfaces in dramatic, visually striking forms. Bathing at Gake no Yu offers the primal pleasure of thermal immersion in a naturally sculpted rocky setting where geology, water, and the human experience of warmth and relaxation converge in the mountain wilderness.