Kakeyu Onsen Center; Monju no Yu
Ueda, Nagano, Japan
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- Location
- Ueda, 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
Kakeyu Onsen Center; Monju no Yu is set in Ueda, Nagano Prefecture, a mountainous area known for its hot springs. The bicarbonate water flows at 40°C, pH 8. The site includes an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — Monju no Yu at Kakeyu Onsen serves one of Nagano's most celebrated springs, where the softening waters have drawn visitors since the Edo period — a tradition so respected that Kakeyu earned designation as one of Japan's leading hot springs. The spring name derives from the legend that a hunter chasing a deer discovered the spring when the animal bathed in the warm pool — a manifestation of the Monju Bodhisattva of wisdom disguised as a deer, delivering warm water to humanity.
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.