Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Tennen Onsen Yuan, in Himeji, Hyogo Prefecture, offers iron-rich thermal water at 41°C. Bathers can use an indoor bath, an outdoor bath (rotenburo) and a sauna.
Insider tip — Tennen Onsen Yuan in Himeji is a natural spring bathhouse offering iron-rich waters just minutes from the UNESCO World Heritage Himeji Castle. The characteristic amber-toned water is believed to aid circulation and relieve muscular tension, making it a popular post-sightseeing stop. The facility provides private family baths alongside public pools, catering to international visitors unfamiliar with communal bathing customs. Evening visits are particularly atmospheric as the illuminated castle shimmers in the distance.