Valley

:This article is about the physical-geographic term. For places named "Valley" see Valley (disambiguation).

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A valley is a landform, which can range from a few square miles (square kilometers) to hundreds or even thousands of square miles (square kilometers) in area. It is typically a low-lying area of land, surrounded by higher areas such as mountains or hills.

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Valleys are formed by numerous geographical processes. Glacial valleys, which are usually U- rather than V-shaped, were formed tens of thousands of years ago (most likely during the last Ice Age) by the massive erosive power of glaciers. Several glacial valleys can be found in the English Lake District and many can be found in Alpine countries. Rift valleys, such as the Great Rift Valley, are formed by the expansion of the Earth's crust due to tectonic activity beneath the Earth's surface. Valleys are, however, most commonly formed by fluvial activity (the action of running water, such as rivers), which erodes the landscape.

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Landform: A landform comprises a geomorphological unit. Landforms are categorised by characteristics such as elevation, slope, orientation, stratification, rock exposure, and soil type. Landforms by name include berms, mounds, hills, cliffs, valleys, and so forth. Oceans and continents exemplify highest-orde...

Square mile: :This article is about the unit of measure. The Square Mile is a traditional name for the City of London in Britain....

Square kilometer: REDIRECT Square kilometre...

Valley related Images and Photos (experimental)

Valley II	Valley Oaks	Valley View	Valley View
Valley Green	Valley Vista	Valley Evening	Valley View I
Deep Valley (DVD)	Valley View II	Sun Valley	Iao Valley