Hailin is a county-level city, under the administration of the prefecture-level city of Mudanjiang, in the southeast of Heilongjiang province, China, bordering Jilin province to the southwest. It has an area of 8,816 km2 (3,404 sq mi), and a population of 422,000. Ethnic groups include the majority Han Chinese as well as significant numbers of Manchu and ethnic Koreans.