Kawachi Onsen; Ajisai no Yu
Kitakyūshū, Fukuoka, Japan
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- Location
- Kitakyūshū, 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
Kawachi Onsen, known as Ajisai no Yu, is in Kitakyūshū, Fukuoka Prefecture. Its sodium-chloride thermal water reaches 39°C, with an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — 'Ajisai no Yu' (紫陽花の湯 — hydrangea spring) at Kawachi Onsen in Kitakyushu. Kawachi Gorge in Kitakyushu is famous for its dense hydrangea (ajisai) gardens, which turn hillsides vivid blue-purple in June. The thermal spring beside this gorge captures the seasonal drama of Kyushu's rainy season — when rain falls, hydrangeas bloom, and the outdoor bath steams in the warm humidity. Kitakyushu's eco-city transformation is perhaps Japan's most remarkable post-industrial environmental recovery.
Nearby
Kitakyushu Kurosaki Onsen
Kurosaki, Kitakyushu, Fukuoka Prefecture
Yuttari Onsen; Seaside Spa
Kitakyūshū, Fukuoka
Otomodachi no Yu Tobata
Tobata Ward, Kitakyushu, Fukuoka Prefecture
Super Sento; Hana no Yu
Kitakyūshū, Fukuoka
Yahata Onsen Kitakyushu
Yahata Ward, Kitakyushu, Fukuoka Prefecture
Ongagawa Onsen
Onga, Fukuoka
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.