The Longyuan Lake is a beautiful ecological name card of Harqin Left Wing Mongolian autonomous county, Chaoyang city, Northeast China’s Liaoning province. In summer, the lakeside is enveloped by the wavering shadow of green trees. The gentle breeze blows over the lake surface, forming shimmering waves. Against the backdrop of the azure sky and white clouds, the entire scenic spot is particularly tranquil and relaxing.