The ancient city of Liangzhu is rectangular in shape with rounded corners, and faces north. The city extends 1,500-1,700 meters from east to west, and 1,800-1,900 meters north to south. The 6 kilometers of wall surround an area of 2.9 million square meters: the size of the Summer Palace. The adobe walls, built on stone foundations, are the widest existing walls found thus far... The Liangzhu culture is a prehistoric culture, dating back to BC 5,000- BC 4,000. The sphere of its influence reached as far as Shanxi to the north, and to Guangdong in the South. It is among...