Tonooka Onsen Yumoto Yu-min
Iida, Nagano, Japan
- Location
- Iida, 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
Tonooka Onsen Yumoto Yu-min is set in Iida, Nagano prefecture, in the Japanese Alps. Its bicarbonate water emerges at 40°C with a slightly alkaline pH of 8, alongside an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Tonooka, the hill of the lord, overlooks the Iida basin where the Southern Alps and Central Alps face each other across the Ina Valley. The soft bicarbonate spring waters are perfect for the long-distance hikers who use Iida as a gateway to the Minami Alps Wilderness.
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.