Tengchong county in southwest China's Yunnan province is a hidden gem among the province's growing list of tourism destinations. Tengchong is famous for its geothermal energy, being one of China’s three geothermal regions, with more than 80 hot springs where the highest temperature reaches 96.3 degrees centigrade. The Thermal Sea, or Rehai in Chinese, is located in the center of geothermal region in the county.

The king of Rehai's hot springs is known as the "Boiling Pot". As the heat is too much for the human body to withstand, the "Boiling Pot" has been adapted to boil food such as eggs and peanuts, which are then served as snacks to tourists who emerge from the area's surrounding hot springs.

The other main draw for Tengchong is the volcanoes, which number nearly one hundred, and the traditional villages of the Lisu ethnic minority. Each village enjoys its own hot spring.

The scenic area is built around the scattered hot springs, all of which have their own distinctive mineral content. The open air springs are surrounded by seasonal blooms of flowers and a view of green mountains looming in the distance.