Thermal water

Hot water rich in salts, bromine, iodine and gases. Usually it starts as rainwater in the mountains (an exception is Hungary where thermal water comes from what was once the Panonian sea). Having been forced through the subsoil to a depth of nearly 10,000 feet below sea level, the water becomes enriched with mineral salts and is progressively heated on its journey before emerging under pressure in the form of a geyser at temperatures between 70 and 87 degrees Celsius (158-190 F).

This treatment is currently offered at the following destinations:

Germany
Hungary
Italy
Slovakia