Yancheng Site is located in Yancheng Administrative Village, Hutang Town, Wujin District, Changzhou City, Jiangsu Province. 1988 was announced as a national key cultural relics protection unit.

Yancheng, built in the late Spring and Autumn Period, is the best preserved ancient city site in China. From the inside out, it consists of Zicheng, Zicheng River, Inner City, Inner City River, Outer City and Outer City River. This architectural form is unique among the urban relics in China. Zicheng, square, with a circumference of 500 meters; The inner city is square with perimeter1500m; The outer city is irregular oval with a circumference of 2500 meters. There is also an outer wall with a circumference of 3500 meters.