Kanashima Onsen; Fuki no Yu
Shibukawa, Gunma, Japan
- Location
- Shibukawa, Gunma, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Restorative
LowHigh
Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Also located in Shibukawa, Gunma Prefecture, Fuki no Yu taps sodium-chloride water at 41°C. Visitors have access to an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Fuki no Yu, the butterbur spring, serves the Kanashima district of Shibukawa City between the Akagi and Haruna volcanic ranges of Gunma where the fuki no to (butterbur bud) heralds spring in the forested valleys each March. Shibukawa was the starting point of the ancient Mikuni Kaido highway ascending to the Echigo mountains, and the city preserves the stone-paved remnants of this mountain road that connected the Kanto plain to the Japan Sea coast through the volcanic gorges of the Agatsuma River valley.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.