Sichuan Basin
The westernmost section of the Sichuan Basin is the Chengdu Plain, occupied by Chengdu, provincial capital of Sichuan. The Chengdu Plain is largely alluvial, formed by the Min River and other rivers fanning out when entering the basin from the northwest. This flat region is separated from the rest of the basin by the Longquan Mountains. The central portions of the Sichuan Basin are generally rolling, covered by low hills, eroded remnants of the uplifted Sichuan Basin floor. In some parts of the extreme northern Basin and in Weiyuan County in the southwest, there are ancient dome-shaped low mountains in their own right.