Iwama Onsen

Hakusan, Ishikawa, Japan

Location: Hakusan, Ishikawa, Japan
Water type: bicarbonate
Temperature: 40 °C
pH: 8

Water profile

Thermicity

Sedative

40 °C

LowHigh

Relaxing — deep, immediate muscle release.

Mineralisation

Restorative

LowHigh

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

Buoyancy

Standard buoyancy

LowHigh

Soft water — natural, classic buoyancy.

BicarbonatesSodiumCalcium

Iwama Onsen provides bicarbonate thermal waters whose naturally alkaline chemistry produces the gentle, skin-conditioning bathing experience long associated with this mineral type in Japanese balneology, where bicarbonate springs are affectionately called bijin no yu, or hot springs of beauty. The softening and cleansing properties of bicarbonate mineral water act on the outermost layer of skin during bathing, leaving it smooth and refreshed in a way that has made this water type a perennial favorite among Japanese onsen enthusiasts. Set in the mountainous interior of its host prefecture, Iwama Onsen offers the meditative calm of natural thermal bathing in waters whose mineral character has been valued across many generations of Japanese spa culture.

Insider tip — Iwama Onsen in the Ishikawa highlands lies in the foothills of sacred Mount Hakusan — one of Japan's three holy mountains, a volcanic peak revered for over 1,300 years and protected within the Hakusan National Park. The bicarbonate springs serve a landscape of deep forests and mountain valleys at the gateway to one of Japan's most sacred summits, where the Hakusan faith drew pilgrims and ascetics, and where the onsen offered warmth in the snowy highlands of the Ishikawa interior.

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