Ordos Desert
Shimao () is a Neolithic site in Shenmu County, Shaanxi, China. The site is located in the northern part of the Loess Plateau, on the southern edge of the Ordos Desert. It is dated to around 2000 BC, near the end of the Longshan period, and is the largest known walled site of that period in China, at 400 ha. The fortifications of Shimao were originally believed by to be a section of the Great Wall of China, but the discovery of jade pieces prompted an archaeological investigation.