Lianyungang (simplified Chinese: 连云港; traditional Chinese: 連雲港; pinyin: Liányúngǎng) is a prefecture-level city in northeastern Jiangsu province, 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 (Jiangsu), the highest peak in Jiangsu Province, a few miles from the town center, and the fact that it is a port.
Lianyungang (as Yuntai Mountain) was known in the West as Haichow (Wade–Giles romanization). Haichow was voluntarily opened to foreign trade by the Qing imperial government in 1905.
Lianyungang is between 118°24' and 119°48' east longitude and 34°11' and 35°07' north latitude. Lianyungang covers an area of 7,777 km2 (3,003 sq mi).
The temperature in Lianyungang can reach average highs of 30 °C in the summer and drop to as low as -4 °C in the winter. The vast majority of precipitation occurs between June and August, where it can measure up to 278mm of rainfall on average. Winter precipitation is quite low, making snowfall rare and short-lived.