Nen River or Nenjiang (Chinese: 嫩江; pinyin: Nèn Jiāng, Wade-Giles: Nun-Chiang), or Nonni (Manchu: ; Möllendorff: Non ula) is a river in Northeast China. The Nen River flows through the northern part of Heilongjiang Province and the northeastern section of Inner Mongolia, some parts of the river forming the border between the two regions.