Lianyungang (simplified Chinese: 连云港; traditional Chinese: 連雲港; pinyin: Liányúngǎng) is a prefecture-level city in northeastern Jiangsu province, People's Republic of China. It borders Yancheng to its southeast, Huai'an and Suqian to its south, Xuzhou to its southwest, and the province of Shandong to its north. Its name derives from Lian Island (formally Dongxilian Island) the largest island in Jiangsu Province which lies off its coastline, and Yuntai Mountain, the highest peak in Jiangsu Province, a few miles from its town center, and the fact that it is a port.
Lianyungang (as Yuntai Mountain) was known in the West as Haichow (Wade–Giles romanization). This was one of the four original ports opened up for foreign trade in the 1680s by the Qing Dynasty Government. The others were Ningbo, Xiamen and Guangzhou.