Hirauchi Onsen
- Location
- Yakushima Island, Kagoshima, Japan, Japan
- Water type
- sulfurous
- Temperature
- 40 °C
- pH
- 6.5
Water profile
Relaxing — deep, immediate muscle release.
Rich in active gases or metals — a strong mineral character.
Soft water — natural, classic buoyancy.
Hirauchi Onsen is a famous coastal hot spring on Yakushima Island in Kagoshima Prefecture, Japan, where naturally warm geothermal water wells up through the rocks of the island's rugged shoreline to create tidal pools accessible only at low tide, when the receding sea reveals the natural rock basins filled with warm, naturally mineralised water. Yakushima Island, a UNESCO World Heritage Site, is home to ancient cedar forests and extraordinary biodiversity, and the Hirauchi Onsen adds a geothermal dimension to the island's remarkable natural heritage — a place where bathers must time their visit to the rhythm of the ocean tides, creating an experience of bathing uniquely connected to the natural cycles of sea and earth.