Aerial photo taken on July 31, 2018 shows the scenery of Zhalong National Nature Reserve in Qiqihar, northeast China's Heilongjiang Province. Zhalong National Nature Reserve, covering 2,100 square kilometers, was set up in 1979 in a northeast China's reed wetland. It provides a major habitat for red-crowned cranes and other wildlife. (Xinhua/Wang Kai)