The greening landscape in the park of the Tuanchenghu Regulating Reservoir situated to the south of the Summer Palace in Beijing. The Tuanchenghu Regulating Reservoir is a key facility for the Beijing section of the South-to-North Water Diversion Project, which is the largest water diversion project in the world and designed to alleviate water shortages in Northern China. [Photo by Sun Tao/China.org.cn]