Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Hakusan Onsen sits at the foot of Mount Hakusan, one of Japan's three sacred mountains alongside Fuji and Tateyama, a volcanic massif whose white-capped summit has been revered by mountain ascetics and pilgrims since the eighth century when the monk Taicho first climbed its glaciated peak. The sodium-bicarbonate spring water carries the mineral character of waters filtered through the volcanic geology of Hakusan's ancient lava fields, offering warming, restorative baths that soothe muscles tired from mountain hiking and the challenges of Hakusan's demanding alpine terrain. The Hakusan Shrine network of worship sites descending from the summit to the lowland villages gives this onsen area a sacred dimension rare among Japanese thermal destinations.
Insider tip — Hakusan Onsen sits at the foot of one of Japan's Three Holy Mountains, the 2,702-metre volcanic peak of Hakusan, whose snowfields feed clear mountain streams year-round. The bicarbonate spring water emerges at 40°C, carrying a faint mineral sweetness derived from granite and limestone geology. Mountain pilgrims ascending to Hakusan Shrine have historically used these baths for purification before the summit climb.