Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
Taiheiyo Kenko Center, Iwaki Kani Arai Onsen, is located in Iwaki, Fukushima prefecture, Japan. Its iron-rich water, at 38°C, fills an indoor bath, an outdoor rotenburo and a sauna.
Insider tip — Taiheiyo Kenko Center's Iwaki Kani Arai Onsen taps iron-rich thermal water along the Pacific coast of Fukushima Prefecture. The reddish-tinted baths are known for improving circulation and warming the body deep into cold coastal winters. The seafront location means you can hear the ocean while soaking. Arrive at dusk for a memorable view of the Pacific horizon from the outdoor bath.