The Summer Palace is a well representative Chinese artwork in terms of both garden design and construction. In December 1998, UNESCO included the Summer Palace in its World Heritage List. The Tuancheng Lake in the Summer Palace is Beijing’s main water source. The water from Miyun Reservoir was transferred into the Tuancheng Lake through the Diversion Canal and then diverted to the urban districts of Beijing. The lake is also a key component for the Beijing section of the South-to-North Water Diversion Project.