Shinshu Hiraya Onsen Himawari no Yu
Hiraya, Achi Village, Nagano Prefecture, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Hiraya, Achi Village, Nagano Prefecture, 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
Shinshu Hiraya Onsen Himawari no Yu is tucked away in Hiraya, Achi Village, Nagano Prefecture. Its bicarbonate water rises at 40°C, shared across an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — Himawari no Yu sits in the remote Hiraya plateau of southern Nagano at over 900 meters, surrounded by sunflower fields and mountain scenery. The bicarbonate waters are gentle on skin and are reputed to be a beauty spring beloved by female bathers. The alpine setting and clear mountain air make soaking here a distinctly serene Nagano highland experience.
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 (idéal automne-hiver).