In the earth sciences and geology sub-fields a landform or physical feature comprises a geomorphological unit, and is largely defined by its surface form and location in the landscape, as part of the terrain, and as such, is typically an element of topography. Landform elements also include seascape and oceanic waterbody interface features such as bays, peninsulas, seas and so forth, including sub-surface terrain features such as submersed mountain ranges, volcanoes, and the great ocean basins under the thin skin of water, for the whole earth is the province and domain of geology.

This panorama in Great Smoky Mountains National Park has the readily identifiable physical features of a rolling plain, actually part of a broad valley, distant foothills, and a backdrop of the old much weathered Appalachian mountain range.

Physical characteristics

Landforms are categorised by characteristic physical attributes such as elevation, slope, orientation, stratification, rock exposure, and soil type.

Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas and numerous other structural and size-scaled (i.e. Ponds vs. Lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodies and sub-surface features.

Heirarchy of classes

Oceans and continents exemplify the highest-order landforms. Landform elements are parts of a high-order landforms that can be further identified and systematically given a cohesive definition such as hill-tops, shoulders, saddles, foreslopes and backslopes.

Some generic landform elements are: pits, peaks, channels, ridges, passes, pools, plains; these can be often extracted from a digital elevation model using some automated techniques^[1]