Haeju is a city located in South Hwanghae Province near Haeju Bay in North Korea. It is the administrative centre of South Hwanghae Province. As of 2008, the population of the city is estimated to be 273,300. At the beginning of the 20th century, it became a strategic port in Sino-Korean trade. Haeju has chemical-related enterprises and a cement factory.

The Korean War was fought between North Korea and South Korea from 1950 to 1953. It began on 25 June 1950 when North Korea invaded South Korea and ceased after an armistice on 27 July 1953. North Korea was supported by China and the Soviet Union while South Korea was supported by the United States and US-led United Nations (UN) forces.