Nishi Shimonita Onsen; Arafune no Yu
Shimonita, Gunma, Japan
- Location
- Shimonita, Gunma, Japan
- Water type
- thermal, 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
In Shimonita, Gunma, Japan, Nishi Shimonita Onsen; Arafune no Yu taps a spring whose thermal bicarbonate water reaches 40°C. Indoor bath, rotenburo and sauna round out the offering.
Insider tip — 'Arafune no Yu' at Nishi Shimonita Onsen takes its name from the extraordinary Arafune Cold Cave (荒船風穴) nearby — a designated UNESCO Cultural Heritage site (Tomioka Silk Mill and Related Sites) where natural cold air supports sericulture. A unique region where ice and hot springs coexist. The town is also famed for its Shimonita negi (Japanese leeks).
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 thermal & bicarbonate water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.