Yamakawa Onsen

Yufu, Oita, Japan

Location: Yufu, Oita, Japan
Water type: carbonated
Temperature: 38 °C
pH: 6.3

Water profile

Thermicity

Neutral

38 °C

LowHigh

Soothing — neither hot nor cold, perfect balance.

Mineralisation

Restorative

LowHigh

Loaded with major ions — the essential minerals (Ca, Mg).

Buoyancy

High buoyancy

LowHigh

Mineralised water — eases movement and joints.

CO2BicarbonatesMagnésium

Yamakawa Onsen—the Mountain River Spring—takes its name from the river that animates its landscape, and its carbonated waters add to that sense of natural energy by bringing the effervescent CO2 character that makes carbonated springs among the most lively and skin-stimulating mineral types in Japan's thermal bathing tradition. Natural carbonation in thermal springs—called tansan-sen in Japanese—is highly prized for the lively, tingling sensation it brings to the skin, earning carbonated springs a devoted following among Japanese onsen enthusiasts who seek the most physically invigorating mineral soak. The combination of mountain river scenery and the sparkling vitality of naturally carbonated mineral water creates a bathing experience that is both visually and physically invigorating.

Insider tip — Yamakawa Onsen emerges in the volcanically active Oita region of Kyushu, where carbon dioxide-charged waters bubble to the surface at a refreshing 38°C. The natural carbonation coats bathers in tiny bubbles, stimulating circulation and earning these springs a reputation as the "champagne baths" of the Beppu-Yufuin thermal corridor. The fizzy water is mild on the skin despite its volcanic origin and is prized for cardiovascular benefits. Visitors can combine a dip with the famously scenic drive through the steaming Beppu lowlands.

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