Nenjiang City, formerly Nenjiang County, is a county-level city under the administration of Heihe prefecture-level city in northwestern Heilongjiang province, China. It is located on the river of the same name, which also forms part of the provincial border with Inner Mongolia, more than 200 kilometres (120 mi) southwest of the urban area of Heihe. The city seat is Nenjiang Town. Land area 15,360 square kilometres (5,930 sq mi), population 500,000.