Shiroishi Katta Onsen
- Location
- Shiroishi, Katta District, Miyagi Prefecture, Japan
- Water type
- calcium-rich
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Shiroishi Katta Onsen is a hot spring facility in Shiroishi, a city in southern Miyagi Prefecture, Japan, historically significant as the castle town of the Katakura clan — loyal retainers of the legendary Date Masamune, the 'One-Eyed Dragon' of Sendai who unified the Tohoku region in the late 16th century — whose distinctive restored Shiroishi Castle overlooks the Shiroishi River. The naturally calcium-rich spring waters here are valued in Japanese onsen tradition for their contribution to bone health, skin nourishment, and muscular relaxation, offering visitors exploring the Date clan's historical landscape a therapeutic mineral soak. Combining the rich Sengoku period heritage of the Date domain, the atmospheric presence of Shiroishi Castle, and the mineral wellness of natural calcium spring bathing, Shiroishi Katta Onsen provides a historically resonant thermal experience in southern Miyagi Prefecture.