Tennen Onsen Sento; Ayoro Onsen
Shiraoi-cho, Hokkaido, Japan
- Location
- Shiraoi-cho, Hokkaido, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Ayoro Onsen (Tennen Onsen Sento) is located in Shiraoi, on the island of Hokkaido, Japan. The natural sodium-chloride water reaches about 41°C, with an indoor bath, an outdoor rotenburo bath and a sauna available to visitors.
Insider tip — In Shiraoi, home to the Upopoy National Ainu Culture Museum opened in 2020 on the shores of Lake Poroto, Ayoro Onsen carries an Ainu-derived name honoring the indigenous heritage of Hokkaido; bathe in mineral waters that connect to the island's original peoples, then walk the lakeside museum complex for the most immersive Ainu cultural experience in Japan.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.