Reference work entry
A plain contains slightly undulating broad and flat ground with few valleys. Based on the elevation, plains can be divided into low (less than 200 m) and high plains. They can also be classified into tectonic-erosive plains and alluvial, marine and lacustrine plains. The three major plains in China are the Northeast Plain, North China Plain and the middle and lower reaches of the Yangtze River (Fig. 21).
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