Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Fujiyama Onsen, in Fujiyoshida, Yamanashi Prefecture, at the foot of Mount Fuji, draws sodium-chloride thermal water at 40°C. It offers an indoor bath, an outdoor bath (rotenburo) and a sauna.
Insider tip — Fujiyama Onsen sits at the foot of Mt. Fuji in Fujiyoshida — the city most intimately connected with the sacred mountain through the Kitaguchi Hongu Sengen Taisha shrine, the traditional starting gate for the Yoshida Pilgrim Trail to Fuji's summit. Outdoor baths here frame a direct view of Fuji's snow-capped cone — one of Japan's most iconic thermal panoramas. The Fuji Five Lakes spread out in the surrounding plateau; Lake Kawaguchiko's cherry-blossom-and-Fuji composition is a 20-minute drive.