Kawaji Onsen Nasu
- Location
- Kawaji, Nikko, Tochigi Prefecture, Japan
- Water type
- bicarbonate
- Temperature
- 41 °C
- pH
- 8
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Soft water — natural, classic buoyancy.
Kawaji Onsen is a charming hot spring village in the Nikko region of Tochigi Prefecture, situated in a scenic river valley where bicarbonate-rich thermal waters have long been appreciated within a thermal tradition in the deep forested mountains of the Kanto interior. The alkaline sodium-bicarbonate composition of these waters—sometimes called 'beauty waters' in Japanese tradition—is prized for the softness it leaves on the skin and the deep relaxation it brings after a day exploring the surrounding mountains. Surrounded by riverside ryokan inns and maple trees that turn blazing red in autumn, Kawaji Onsen embodies the quintessential Japanese onsen experience where natural beauty and mineral bathing are inseparable.