Unnan Onsen
- Location
- Unnan, Shimane Prefecture, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Unnan Onsen is located in Unnan City, Shimane Prefecture, an inland agricultural area in the Hii River basin where the Izumo cultural sphere — associated with some of Japan's oldest Shinto traditions and mythological heritage — extends from the coast deep into the mountainous interior of the San'in region. The siliceous thermal waters here flow through a city that maintains strong ties to traditional Shimane crafts and agricultural practices, including the production of Izumo-region sake and iron sand-smelting (tatara) culture that gave Japan its legendary sword steel. These onsen provide a quiet retreat in a culturally rich Shimane landscape where ancient Japanese myths, artisanal traditions, and hot spring bathing culture coexist in authentic rural community life.