Ongagawa Onsen
Onga, Fukuoka, Japan
- Location
- Onga, Fukuoka, Japan
- Water type
- thermal, sodium chloride
- Temperature
- 39 °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
Ongagawa Onsen, in Onga, Fukuoka Prefecture, draws sodium-chloride thermal water at 39°C. It offers an indoor bath, an outdoor rotenburo bath and a sauna for visitors to relax in.
Insider tip — 'Ongagawa Onsen' named after the Onga River (遠賀川) — one of the rivers that drained the great Chikuho coalfield of northern Fukuoka. Onga-cho sits in the middle reaches of this river, where coal barges once moved the black gold to Wakamatsu port. The post-coal transformation of the Onga River valley is one of Japan's more successful industrial heritage transitions — wetland restoration and community renewal in the former coal dust landscape.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 39 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features thermal & sodium chloride water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.