Kamisu Onsen
- Location
- Kamisu, Ibaraki, 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.
Kamisu Onsen serves a coastal city on the Pacific shoreline of southeastern Ibaraki, where the Kashima Sea opens to the broad Pacific and vast industrial complexes of the Kashima Coastal Industrial Zone — one of Japan's largest planned industrial developments — share the coastline with fishing communities and coastal pine forests that have sheltered the shore for centuries. The city's position on the low-lying coastal plain between the Tone River delta and Kashima Nada gives it a maritime character defined by ocean winds, sea fishing, and the distinctive flat horizon of the Pacific shore. The onsen's siliceous geothermal waters, drawing from the deep sedimentary aquifers of the coastal Ibaraki plain, provide a warm therapeutic resource for a community whose daily life is shaped by the constant presence of the sea and the industrial energy of one of Japan's most ambitious postwar coastal development projects.