Definition:
Landform refers to any physical, recognizable form or feature on the earth’s surface, having a characteristic shape, and produced by natural causes; it includes major forms such as a plain, plateau, or mountain, and minor forms such as a hill, valley, slope, esker, or dune. Taken together, the landforms make up the surface configuration of the earth.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO-SAFR, 2002, Irrigation Manual Module 2, Natural Resources Assessment, By: Andreas Savva & Karen Frenken