Eco-systems in upper reaches of Yangtze River protected in China's Sichuan

This aerial photo taken on July 5, 2017 shows a wetland park in Suining, southwest China's Sichuan Province. In recent years, authorities in Sichuan have carried out a series of ecological projects to protect eco-systems in the upper reaches of the Yangtze River. (Xinhua/Xue Yubin)