Shimoda Shirahama Onsen Izu
- Location
- Shirahama, Shimoda, Izu Peninsula, Shizuoka Prefecture, Japan
- Water type
- sodium chloride
- Temperature
- 41 °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.
Shimoda Shirahama Onsen Izu is a thermal spa in Shimoda, a historically significant port city at the southern tip of the Izu Peninsula, Shizuoka Prefecture, Japan, whose Perry Road and Ryōsenji Temple mark the 1854 Japan-USA Convention of Kanagawa — the treaty that ended Japan's 250-year isolation and opened the country to the modern world. The chloride-sodium onsen waters, characteristic of Izu's volcanic coastal thermal zone, are valued for their skin-softening and circulation-enhancing properties, offering a soothing wellness retreat close to Shirahama Beach — one of the Izu Peninsula's most beautiful white sand beaches. Combining profound historical significance, natural beach beauty, and authentic thermal spring culture, Shimoda Shirahama Onsen offers one of the Izu Peninsula's most culturally layered hot spring experiences.