Kawayu Onsen Kumano
Hongu, Wakayama Prefecture, Japan
- Location
- Hongu, Wakayama Prefecture, 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
Immerse yourself in the unique Kawayu Onsen Kumano experience, where a centuries-old tradition meets modern relaxation. This natural hot spring is situated along the Oto-gawa riverbed and features bicarbonated water. Discover why Kawayu is considered the most original onsen in Japan.
Insider tip — Kawayu Onsen in the Kumano Kodo pilgrimage corridor is built directly on a river bed: guests dig their own baths in the gravel of the Oto River, where geothermal water seeps up to mix with the cool stream. In winter the entire riverbed is dammed to create the legendary Sennin-buro communal bath. Arrive at dusk when lanterns reflect on the water and the cedar forest quiets around you.
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 (idéal automne-hiver).