Landforms together make up a given terrain, and their arrangement in the landscape is known as topography.- Landform
Land surface objects, or landforms, are definite physical objects (lines, points, areas) that differ from the surrounding objects.- Terrain
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Topography is the study of the forms and features of land surfaces.
Topography in a narrow sense involves the recording of relief or terrain, the three-dimensional quality of the surface, and the identification of specific landforms; this is also known as geomorphometry.