"Some volcanos develop huge underground reservoirs of superheated water. Over time, this water will escape to the surface . cooling on the way. There are two fissures at Hot Water Beach issuing water as hot as 64°C (147°F) at a rate as high as 15 litres/minute. This water contains large amounts of salt (NOT salt water), calcium, magnesium, potassium, fluorine, bromine and silica. There are other hot water springs nearby but the location of these two springs on the beach make them unique..." During low tide hours, visitors to Hot Water Beach can dig holes in the sand and immerse themselves in the hot water.