Kirizumi Onsen
- Location
- Kirizumi, Gunma, Japan
- Water type
- thermal
- Temperature
- 40 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Rich in trace elements — gentle on the skin.
Soft water — natural, classic buoyancy.
Kirizumi Onsen—Fog Accumulation Spring—in Annaka City, Gunma Prefecture, carries a name evoking the dense mist that settles in the enclosed valley landscape of this simple alkaline spring, and was historically celebrated in Japanese balneological lore with the maxim 'rough soak at Kusatsu, finishing touch at Kirizumi'—suggesting that the harsh, highly acidic and intense waters of the famous Kusatsu Onsen paired well with the gentle, completing soak of Kirizumi's simple alkaline waters to restore the skin's balance after Kusatsu's intensive mineral bath. This historical pairing with Kusatsu—one of Japan's most celebrated and powerful springs—establishes Kirizumi as a spring valued for its complementary, finishing quality rather than its own dramatic mineral intensity, filling the role of the gentle finalizing soak that completes what Kusatsu's intensity began. The fog accumulation name and finishing-touch role create a spring of quiet, completing character within the broader Gunma spring tradition.