四川盆地
East of the Tibetan Plateau, deeply folded mountains fan out toward the Sichuan Basin, which is ringed by mountains with 1,000–3,000 m elevation. The floor of the basin has an average elevation of and is home to one of the most densely farmed and populated regions of China. The Sichuan Basin is capped in the north by the eastward continuation of the Kunlun range, the Qinling, and the Dabashan. The Qinling and Dabashan ranges form a major north–south divide across China Proper, the traditional core area of China. Southeast of the Tibetan Plateau and south of the Sichuan Basin is the Yunnan-Guizhou Plateau, which occupies much of southwest China. This plateau, with an average elevation of , is known for its limestone karst landscape.