辽东湾
The Northeast China Plain (), commonly known as Songliao Plain or the Manchurian Plain or just the Northeast Plain, is located in Northeast China, historically also known as Manchuria. It lies between the Greater and Lesser Khingan and Changbai mountains, ending at the coast at Liaodong Bay in the Bohai Sea. Covering 350,000 km2, it is China's largest plain, with an elevation of lower than 200 meters, and less than 100 meters to the southwest. The Songhua, Nen, and Liao rivers run through it. The Manchurian Plain of Asia is the other name of the Amur valley.