Tazawa Onsen Arunyu
Aoki, Nagano, Japan
- Location
- Aoki, Nagano, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Tazawa Onsen Arunyu, in the village of Aoki, Nagano, relies on bicarbonate water at 40°C. An indoor bath, an outdoor rotenburo and a sauna are available.
Insider tip — Arunyu at Tazawa Onsen serves the remote mountain village of Aoki-mura in the Nagano eastern Alps foothills where the Tazawa valley preserves one of the most isolated agricultural communities in the Ueda basin hinterland. Aoki-mura maintains the highest proportion of traditional thatch-roofed farmhouses (kayabuki) in Nagano Prefecture — the village has made conscious efforts to preserve its architectural heritage as a living agricultural landscape — and the spring emerges in a valley of persimmon orchards, terraced rice paddies, and cedar-forested ridges that characterize quintessential Shinshu mountain character.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 40 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.