Tennen Toyoura Onsen Shiosai
Toyoura, Hokkaido Prefecture, Japan
- Location
- Toyoura, Hokkaido Prefecture, 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
Tennen Toyoura Onsen Shiosai is located in Toyoura, Hokkaido Prefecture, by the sea. Its sodium-chloride water reaches around 41 °C (106 °F). The facility includes an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — Tennen Toyoura Onsen Shiosai draws naturally occurring sodium-chloride spring water from beneath the Uchiura Bay shoreline in southern Hokkaido, creating the classic 'nuru-nuru' slippery sensation favored in Japanese bathing culture. The name 'Shiosai' means sound of the waves, reflecting the facility's proximity to the bay where Pacific salmon runs attract brown bears in autumn. The seawater-influenced mineral composition warms the body efficiently, making this especially popular during Hokkaido's long, cold winters. Panoramic bay views from the baths add a dramatic maritime dimension to the soaking experience.
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 (idéal automne-hiver).