Chinese History and Statistics -- Page 7
Yunnan-Guizhou Plateau Upland
The fifth and most southerly of the five middle elevation sub-regions is the Yunnan-Guizhou Plateau upland, located in Yunnan and Guizhou provinces. Underlain mainly by limestone, the plateau is known for spectacularly eroded karst scenery, often depicted in traditional Chinese painting.
The lowest elevation step, occupying lands less than 1,000 m (3,300 ft) above sea level, lies in eastern China. It consists of three sub-regions: the eastern lowland, the eastern Manchurian upland, and the southeastern upland.
By far the most important sub-region is the eastern lowland, which covers only about 10% of China's total area but is where most of China's huge population is concentrated. The principal lowlands of this region are the lowlands of the Manchurian plain, which are drained by the Liao River and upper reaches of the Songhua River; the alluvial North China plain, drained by the Huang He; and the vast plains of the Chang Jiang lowland, drained by the Chang Jiang and Huai River, in central China. The Chang Jiang and Huang He are both exceptionally flood prone.
The second low-lying sub-region is the eastern Manchurian upland, located in northeastern China, east of the Manchurian plain. Although referred to as upland, the region consists of low hills with elevations of less than 900 m (3,000 ft).