Shido Onsen Kagawa
- Location
- Shido, Higashi-Kagawa, Kagawa, Japan
- Water type
- sodium chloride
- Temperature
- 44 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Shido Onsen is located in the Sanuki area of Kagawa Prefecture on Shikoku island, in a coastal landscape facing the Seto Inland Sea, where chloride-rich thermal waters draw from geothermal sources associated with the volcanic and tectonic geology underlying Japan's smallest prefecture and the island home to the 88-temple Kobo Daishi pilgrimage. The sodium-chloride mineral composition of Shido's hot springs is valued in Japanese onsen culture for its deeply warming character, its association with well-being, and the skin-conditioning quality of regular mineral immersion in the mild maritime climate of the Seto Inland Sea coast. The Sanuki coast's historical significance as a centre of salt production—using the shallow inlets and tidal flats of the Inland Sea—and the region's association with Kagawa's celebrated udon noodle tradition frame this coastal onsen within the rich culinary and maritime heritage of one of Japan's smallest and most culturally distinctive prefectures.