Nantian Hot Spring
From Wiki China org cn
Located to the southeast of Sanya, the hot mineral water from the geothermal field at Nantian is 57 degrees Centigrade on average. Its fluorine and metasilicate content reaches the standard for fluorine-metasilicate mineral water, and its radon content meets the requirement for therapeutic fluorine-silicon hot mineral water. Producing 10,000 cubic meters of water per day, it is the largest therapeutic hot spring field in China.