Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
SoufreSulfuresSulfates
This free hot spring footbath is located in Shimabara, Nagasaki Prefecture, Japan. The sulfurous water reaches around 42°C, set in an open-air pool suited to casual, wild bathing.
Insider tip — This free outdoor footbath near Shimabara on the Shimabara Peninsula taps the volcanic thermal system fed by Mount Unzen, one of Japan's most historically active volcanoes. Sulfurous vapour drifts from the surface and the water runs at a consistent 42 degrees Celsius even in winter. Footbaths of this type are a Kyushu tradition, offering a no-cost thermal experience to travellers passing through. Combine a visit with a stroll through Shimabara's samurai-era canal district nearby.