Ayukawa Onsen; Kanai no Yu
Fujioka, Gunma, Japan
- Location
- Fujioka, Gunma, Japan
- Water type
- thermal, sodium chloride
- Temperature
- 39 °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
Ayukawa Onsen (Kanai no Yu) is a hot spring in Fujioka, Gunma Prefecture, Japan. Its sodium-chloride thermal water sits around 39°C. Bathers can use an indoor bath, an outdoor rotenburo bath and a sauna, typical of Japanese mountain bathhouses.
Insider tip — 'Kanai no Yu' (household/domestic waters) at Ayukawa Onsen in Fujioka, Gunma — a gateway city to the mountains of the Kanto range. Ayukawa means 'sweetfish river,' evoking the clear mountain streams of this foothill landscape. A community onsen with the welcoming feel of a traditional family bath.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 39 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features thermal & sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.