Yancheng, formerly known as Yandu, is a prefecture-level city in the eastern coastal Jiangsu province, People's Republic of China. As the city with the largest jurisdictional area in Jiangsu, Yancheng borders Lianyungang to the north, Huai'an to the west, Yangzhou and Taizhou to the southwest, Nantong to the south, and the Yellow Sea to the east. Formerly a county, the current Yancheng city was founded on January 18, 1983.