Ago Bay Onsen Shima
- Location
- Shima, Préfecture de Mie, 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.
On the Shima Peninsula in Ise Bay, Mie Prefecture, Ago Bay opens into an intricate landscape of drowned valleys, pine-covered islets, and pearl-farming rafts floating on calm turquoise water. Nestled in this quietly beautiful marine setting, the sodium-chloride onsen of Shima draw water from close to the sea, delivering a bath at 41 °C with a faintly saline warmth that feels inseparable from the ocean surrounding the peninsula.
Soaking in these heated salt waters continues a coastal bathing tradition deeply rooted in the maritime culture of Shima — homeland of the ama, the free-diving women who harvest oysters, abalone, and pearls by hand from generation to generation. Ryokan inns lining the bay combine kaiseki cuisine centred on the region's exceptional seafood with the quiet pleasure of a thermal bath overlooking the evening lights of the water.
Mie Prefecture is also home to the Grand Shrine of Ise, the holiest site in Shinto, whose ancient cedar forest provides a serene counterpoint to the animated marine life of Ago Bay. The journey between spiritual contemplation, extraordinary food, and thermal bathing makes this one of Japan's most distinctive travel experiences.