Muroga Onsen Sasara 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
Muroga Onsen Sasara no Yu sits in Ueda, Nagano Prefecture. Its bicarbonate waters, at 40°C, feed both an indoor pool and an outdoor rotenburo, alongside a sauna. A straightforward spot to unwind after exploring the Nagano mountains.
Insider tip — Sasara no Yu, named for the bamboo whisk implement of traditional Bon Odori dance, serves Ueda City in the Chikuma River basin of eastern Nagano. Ueda Castle is celebrated as the fortress where the brilliant Sanada Masayuki twice repelled Tokugawa armies with a fraction of their forces in 1585 and 1600, and the Sanada clan legacy of cunning military genius continues to define Ueda identity.
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.