Tenryu Onsen Iida Shinshu

Tenryu Onsen draws bicarbonate mineral water from the geothermal zone beneath the Tenryu river valley in southern Nagano's Shinshu — where the great Tenryu river carves a dramatic gorge through the Akaishi Alps on its journey from the Japanese Alps to the Pacific coast, creating one of central Japan's most scenically spectacular mountain river landscapes. The spa serves the Iida area, known for its abundant apple orchards covering the Ina valley terraces and the folk performing traditions including the Ina Matsuri festivals that have defined this agricultural highland culture for generations. The combination of bicarbonate mineral bathing and the scenic grandeur of the Tenryu valley gorge — whose rapids, suspension bridges, and forested canyon walls are among the most beautiful mountain river vistas in the Japanese Alps — creates a therapeutic experience embedded in extraordinary natural scenery.