Tengchong, located in Yunnan Province, China, is a region rich in geothermal resources, with many hot spring attractions, of which Rehai Hot Spring is one of the most famous. The water source of Rehai Hot Springs comes from geothermal water deep underground, which seeps through cracks and rocks in the earth's crust and rises to the surface to form hot springs. These hot spring waters are rich in minerals and trace elements, which are beneficial to health.