Ikawa Onsen; Kono Yu Onsen
Iizuka, Fukuoka, Japan
Illustration photo — not a verified picture of this exact spot.
- Location
- Iizuka, 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
Ikawa Onsen, also called Kono Yu Onsen, in Iizuka, Fukuoka Prefecture, taps sodium-chloride thermal water at 39°C. Guests can use an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Kono Yu Onsen' at Ikawa Onsen in Iizuka, one of the former coal-mining cities of Fukuoka's Chikuho coalfield — once the industrial heartland of pre-war Japan. Iizuka's coal culture shaped modern Japanese industry; its miners' bathhouses were the original 'democratic' public bath, where every worker cleaned the same coal dust from the same exhausted body. The thermal springs here carry that legacy of communal restoration forward into the post-coal era.
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.