Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Fudangi no Onsen, also known as Tsuru wa Sennen, is located in the Kurume Area, Fukuoka Prefecture. Its iron-rich water reaches around 41°C, with an indoor bath, an outdoor rotenburo bath and a sauna.
Insider tip — Fudangi no Onsen, subtitled Tsuru wa Sennen meaning a crane lives a thousand years, draws a mineral-rich iron spring from the coastal plain north of Fukuoka. The facility markets itself as a longevity bath, playing on the crane symbolism to evoke health and long life. Amber-tinted waters here are unusually high in bicarbonate for the region, softening the typical iron astringency. Locals often soak before dinner at the nearby seafood market stalls.