The Peking Man Site at Zhoukoudian is located on the Longgu Mountain of Zhoukoudian Village in Fangshan District, 48km in the southwest of Beijing. It is a place where mountainous region borders upon the plain, with North China Great Plain in the southeast and mountains in the northwest. The mountains around Zhoukoudian are mostly made up of limestone which, under the erosion of dripping water, formed up into caves of various sizes. On the mountains, there is a natural cave about 140m long running from east to west, known as Peking Man Cave. In 1929, it was in this cave that remains of ancient man was for the first time uncovered and the place was named Zhoukoudian First Site.
