Yubara Onsen
- Location
- Maniwa, Okayama Prefecture, Japan, Japan
- Water type
- bicarbonate
- Temperature
- 40 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Yubara Onsen is located in Maniwa City, Okayama Prefecture, famous throughout Japan for its extraordinary outdoor mixed bathing experience (konyoku) in the Asahi River, where natural hot spring water flows into rock-carved pools directly on the riverbank at the base of a dramatic dam — one of Japan's most famous open-air bathing (rotenburo) experiences and a beloved symbol of traditional Japanese bathing culture's connection to natural landscape. The siliceous thermal waters here emerge at high temperature from the volcanic geology of northern Okayama, and the riverside bathing pools — accessible free of charge at any time and visible from the highway bridge above — have made Yubara one of Japan's most celebrated examples of democratic, nature-integrated hot spring culture. The combination of the dramatic outdoor bathing setting, the surrounding cedar-forested valley of the Asahi River, and the traditional ryokan town atmosphere has made Yubara Onsen a beloved and distinctive destination in western Japan's rich hot spring heritage.