Shiso Yoi Onsen
- Location
- Shiso City, Hyogo Prefecture, Japan
- Water type
- bicarbonate, carbonated
- Temperature
- 40 °C
- pH
- 6.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Mineralised water — eases movement and joints.
Shiso Yoi Onsen in the Yamazaki-cho area of Shiso City, Hyogo Prefecture, is a cold mineral spring (kosen) of mildly alkaline sodium chloride character—a rare spring type that delivers bicarbonate and carbonated mineral qualities at cool rather than hot temperature, making it particularly refreshing in summer while providing year-round access in a single-inn day-trip facility. The spring is notable for its on-site onsen stand where visitors can purchase the mineral spring water to take home—a tradition found at Japan's most celebrated cold springs, where the water's mineral composition is appreciated within a long thermal tradition. This quietly situated spring in the forested hills of Hyogo's Shiso district reflects the understated, community-rooted character of Japan's cold mineral spring culture.