Hot spring introduction: Tanghu Hot Spring, known as Dayan Spring in ancient times, is a high-temperature and high-pressure cyclic hot water spring with a maximum surface water temperature of 84.1°C and a daily flow of 2,050 tons. The spring water is colorless and transparent with a strong smell of hydrogen sulfide. The water quality is good and it flows by itself. It contains carbon dioxide, silicic acid, fluorine, magnesium and other trace elements.