Hirugami Onsen Ashiyu Ahiru no Yu
Achi-mura, Nagano, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Achi-mura, 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
Hirugami Onsen Ashiyu Ahiru no Yu is located in Achi-mura, Nagano prefecture. The bicarbonate water emerges at 40°C. An indoor bath, an outdoor rotenburo and a sauna make up this onsen tucked into the mountains of Nagano.
Insider tip — Hirugami Onsen in Achi village is one of the Three Great Onsen of Shinshu. The alkaline bicarbonate water leaves skin silky smooth — best experienced in an open-air rotenburo under the Ina Valley stars.
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.