Hamasaka Onsen
- Location
- Shinonsen, Hyogo, Japan
- Water type
- sodium chloride
- Temperature
- 40 °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.
Hamasaka Onsen in Shin'onsen Town, Mikata District, Hyogo Prefecture is positioned near Hamasaka Station on the JR San'in Main Line — one of Japan's longest and most scenically dramatic coastal railway routes, threading along the Sea of Japan from Kyoto to Shimonoseki across 670 kilometers of rugged northern Honshu coastline. The spring occupies a setting within Hyogo's San'in Coast Geopark, one of Japan's designated geoparks celebrating the extraordinary geology of the Sea of Japan coast, where volcanic activity, tectonic deformation, and coastal erosion have together produced a landscape of dramatic sea caves, columnar basalt formations, and the kind of raw coastal beauty that draws visitors from across Japan and abroad. Hamasaka Onsen's combination of rail accessibility on the scenic San'in line, its position within a nationally recognized coastal geopark, and the naturally heated mineral waters of its geothermal spring create a destination of unusual geological and atmospheric richness on one of Japan's most compelling and least-overcrowded coastal railways.