Large-scale ancient drainage system discovered in China's Shaanxi

This is a map of the Zhouyuan site in Baoji City, northwest China's Shaanxi Province. Archaeologists in Shaanxi said they have discovered large ponds and ditches at an archaeological site in the province. Located in Baoji City, the Zhouyuan site is believed to be the largest city ruins of the Western Zhou Dynasty (1046-771 B.C.). (Shaanxi Academy of Archeology/Handout via Xinhua)