Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
BicarbonatesSodiumCalcium
Kofu Onsen is a relaxing hot spring in Kofu city, the prefectural capital of Yamanashi, historically known as the castle town of the powerful Takeda clan — Japan's most feared cavalry force in the Warring States period — under the legendary warlord Takeda Shingen. The bicarbonate thermal waters provide skin-nourishing warmth in a basin city surrounded on three sides by Japan's highest peaks, with the Southern Alps to the west, Mount Fuji to the south, and the Yatsugatake to the north creating a dramatic natural amphitheater. Kofu's famous Shosenkyo Gorge — a nationally designated scenic area of polished granite formations and autumn foliage — and the Yamanashi wine country of the Katsunuma grape district enrich any stay with mountain beauty and gastronomic pleasure.
Insider tip — Kofu is the prefectural capital of Yamanashi, ringed by mountains including the Southern Alps and Yatsugatake range, and its urban onsen draws bicarbonate spring water from the deep basin aquifer beneath the city. The alkaline quality is gentle and appreciated for skin care, which aligns well with Yamanashi's wine and peach agriculture culture centered on natural produce. Historic Takeda Shingen's castle ruins on the Maizuru hill nearby offer a cultural complement to the thermal soak.