Highway Onsen Suwako (Kudari)
Suwa, Nagano, Japan
- Location
- Suwa, Nagano, Japan
- Water type
- iron-rich
- Temperature
- 40 °C
- pH
- 6.3
Water profile
Thermicity
Sedative
LowHigh
Relaxing — deep, immediate muscle release.
Mineralisation
Bio-active
LowHigh
Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Highway Onsen Suwako (Kudari), near Lake Suwa in Nagano Prefecture, offers iron-rich water at 40°C, with an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Highway Onsen Suwako (Kudari) sits along the Chuo Expressway descending route near Lake Suwa in Nagano, offering iron-rich thermal water to road-weary travelers making the crossing between the Pacific and Japan Sea sides of Honshu. Lake Suwa is one of Japan's most geothermally active zones, and the iron-laden springs here have a warm amber tint and tonic reputation among long-distance drivers and cyclists. The highway location makes spontaneous stops easy, and the outdoor pool frames a view of the Yatsugatake mountains to the east. The combination of accessible location and genuine thermal water makes this a reliable roadside gem.
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 iron-rich water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année (idéal automne-hiver).