Annaka Onsen
Yao, Osaka, Japan
- Location
- Yao, Osaka, Japan
- Water type
- sodium chloride, thermal
- Temperature
- 41 °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
Annaka Onsen is located in Yao, Osaka Prefecture. It offers sodium-chloride thermal water at 41°C (106°F), served through an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — Annaka Onsen serves Yao's dense residential communities south of Osaka. Yao (八尾) is notable for its large resident Korean-Japanese (Zainichi Korean) community — reflected in vibrant yakiniku (Korean BBQ) restaurants throughout the city, particularly around the Kintetsu Yao station area. Osaka's multicultural character, often overlooked by visitors focused on Dotonbori, runs deepest in working-class suburbs like Yao where immigrant communities built post-war Japan alongside their Japanese neighbors.
Nearby
Frequently asked questions
How hot is the water?
The water runs quite hot here, around 41 °C — a sedative water that brings immediate muscle release.
What type of water is found here?
This spot features sodium chloride & thermal water.
What is the best season to visit?
The most favourable period for this spot is: Toute l'année.