Haeju[a] (Korean pronunciation: [hɛ.dzu]) 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 2000, the population of the city is estimated to be 236,000. 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.