Language Atlas of China
Northeastern Mandarin ( or / "Dōngběiguānhuà" "Northeast Mandarin") is the subgroup of Mandarin varieties spoken in Northeast China with the exception of the Liaodong Peninsula and few enclaves along Amur and Ussuri rivers. The classification of Northeastern Mandarin as a separate dialect group from Beijing Mandarin was first proposed by Li Rong, author of the "Language Atlas of China", in 1989. However, many researchers do not accept the distinction.