A tree planted by President Xi Jinping in 2014 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]