Wasezawa Onsen

Fukushima, Fukushima, Japan

Location: Fukushima, Fukushima, 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

Wasezawa Onsen offers bicarbonate and naturally carbonated waters—a spring type prized in Japanese balneology for the effervescent CO2 that creates a tingling sensation on the skin and is believed to stimulate blood circulation and deliver minerals more effectively through the skin's surface than non-carbonated spring types. The bicarbonate component contributes to the mildly alkaline, skin-softening quality that makes these waters feel luxuriously smooth and refreshing, explaining why bicarbonate springs are often categorized among Japan's bijin no yu (beauty water) thermal types favored for their cosmetic as well as therapeutic effects. This combination of gentle effervescence and alkaline mineral richness makes Wasezawa an unusually pleasant and therapeutically stimulating bathing experience among Japan's diverse volcanic spring types.

Insider tip — Wasezawa Onsen emerges on the western Abukuma highland fringe of Fukushima Prefecture, where bicarbonate-laced carbonated waters bubble to the surface at a refreshing 38°C. The natural carbonic acid tingles the skin, promotes peripheral circulation, and imparts a slight effervescence to the bath that local tradition likens to a natural champagne treatment. Set amid cedar and beech forests, the facility draws health-conscious visitors combining the baths with hiking the Abukuma cave system nearby. The bicarbonate component additionally softens water hardness, leaving hair and skin notably supple.

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