File photo of an excavation at a ditch surrounding the Liangzhu Culture settlement in Yuhang City, Zhejiang Province. (Photo/Xinhua)
3. WORLD'S EARLIEST WATER CONSERVATION SYSTEM
While excavating the Neolithic remains of the Liangzhu, a civilization dating back 5,000 years, archaeologists found a large water project outside the main settlement in Hangzhou, capital of east China's Zhejiang Province.
During excavation, ruins of several large man-made mounds were found, which turned out to be dikes that formed three reservoirs, one covering 9.4 square km, four times the size of Hangzhou's iconic West Lake.
Archaeologists found 11 dikes believed to function as flood control against frequent torrential downpours.
