Heillongtan or Black Dragon Pool (黑龙潭) located on the northern outskirts. This is a new popular summer resort located in Miyun County, about 100 kilometers northeast of Beijing. It is said that hundreds of years ago there was a common well. One day, people saw black dragons pop up from the pond. Farmers have faith in the dragon. It has been transformed into a beautiful park, build a pavilion bridge saloon Chinese. Along the way, there are chestnut trees full of about 4 square kilometers. There is a well-organized water well in the pond and outside there is a marble bridge barrier. The water in the pond springs up from the underground in the water’s eye.