Nenjiang County (simplified Chinese: 嫩江县; traditional Chinese: 嫩江縣; pinyin: Nènjiāng Xiàn) is a county under the administration of Heihe City in northwestern Heilongjiang province, China. It is located on the river of the same name (Nen River), which also forms part of the provincial border with Inner Mongolia, more than 200 kilometres (120 mi) southwest of the urban area of Heihe.