Toyoshina Onsen
- Location
- Azumino (Toyoshina), Nagano (Chubu), Japan
- Water type
- silica
- Temperature
- 40 °C
- pH
- 7.2
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Toyoshina Onsen is situated in the Toyoshina district of Azumino City, Nagano Prefecture, in the picturesque Azumino valley where the alluvial fan created by the Matsukawa River spreads at the foot of the Northern Alps, creating an exceptionally fertile agricultural zone whose traditional farmhouses, apple orchards, and wasabi fields have been celebrated in Japanese landscape painting and photography. The siliceous thermal waters here serve the broader Azumino wellness community, where multiple hot spring facilities complement the valley's outdoor tourism infrastructure of cycling paths, hiking trails, and the stunning alpine scenery of the Hotaka mountain walls rising sharply above the flat valley floor. These onsen provide a warm and restorative experience in one of Nagano's most photographed and beloved pastoral valley landscapes, where the thermal mineral waters of the Japanese Alps enhance the already exceptional natural and agricultural beauty of the Azumino basin.