Sera Onsen
- Location
- Sera, Hiroshima 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.
Sera Onsen is located in Sera Town, Hiroshima Prefecture, a highland agricultural community renowned throughout western Japan for the Sera Highlands Flower Park — one of Japan's most extensive flower gardens featuring over 2.5 million tulips, cosmos, and seasonal blooms across the Sera Plateau's rolling farmland at 400–700 meters elevation. The siliceous thermal waters here complement a seasonal tourism destination where floral beauty and highland cool air draw visitors throughout spring and summer, offering therapeutic mineral bathing as a restorative counterpart to the park's outdoor garden experience. Sera Onsen provides both local community bathing and a memorable addition to any Sera Highlands flower season itinerary in this colorful corner of Hiroshima Prefecture.