Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Yujuku Onsen is a simple thermal spring in Gunma Prefecture, one of Japan's most thermally active regions where numerous celebrated onsens cluster along the volcanic mountain ranges of the Joshinetsu Kogen plateau and the Agatsuma River valley. The name Yujuku—Hot Spring Village—describes a traditional settlement built around thermal bathing, where the spring is not merely an amenity but the organizing principle of community life across centuries of mountain habitation. Gunma's simple alkaline springs are renowned for their high temperature, generous flow rate, and the deep whole-body warming effect that has made the prefecture a premier destination for tojikyaku (therapeutic-stay visitors).
Insider tip — Yujuku Onsen lies in the volcanic highland belt of Gunma Prefecture, drawing bicarbonate-rich waters that have a characteristic soft effervescence on the skin. The spring is historically linked to the healing traditions of Shinto mountain pilgrimages through the Shiga Kogen plateau, and older guests still arrive seeking relief from digestive and circulatory complaints. In autumn the surrounding beech and maple forests ignite in vivid crimson and gold, framing the steam-wreathed baths magnificently.
