Heilongtan was a man-made lake built by the elders and villagers of Quanrenshou County, which solved the drought and drinking water of a county and now the drinking water of Meishan City. There is no over-exploitation of tourism, so it is more original, suitable for a person to indulge in the mountains and rivers (when I am in a bad mood, I will spend two yuan on the bus to clean up my mind), and also suitable for taking my family to go boating in the lake and eat the ecological fish of Black Dragon Beach.