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Valley
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{{about|the physical-geographic term|places named "Valley"|Valley (disambiguation)}} {{Redirect|River valley||River Valley (disambiguation){{!}}River Valley}} {{short description|Low area between hills, often with a river running through it}} {{more citations needed|date=May 2013}} [[File:Salta-VallesCalchaquies-P3140151.JPG|thumb|[[Calchaquí Valley]] in [[Argentina]]]] [[File:Glacier park1.jpg|thumb|U-shaped valley in [[Glacier National Park (U.S.)|Glacier National Park]], [[Montana]], United States]] [[File:Romsdalen.jpg|thumb|[[Romsdalen]] in [[Western Norway]] has almost vertical walls.]] [[File:Fljótsdalur.jpg|thumb|[[Fljótsdalur]] in East [[Iceland]], a rather flat valley]] [[File:Vale dos Frades.jpg|thumb|The Frades Valley in the mountainous region of [[Rio de Janeiro (state)|Rio de Janeiro state]], Brazil]] [[File:Baemsagol MS3812.JPG|upright|thumb|Baemsagol valley of [[Jirisan]], Korea]] A '''valley''' is an elongated low area often running between [[Hill|hills]] or [[Mountain|mountains]] and typically containing a [[river]] or [[stream]] running from one end to the other. Most valleys are formed by [[erosion]] of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by [[glacier|glacial ice]]. These glaciers may remain present in valleys in high mountains or polar areas. At lower latitudes and altitudes, these [[glaciation|glacially formed]] valleys may have been created or enlarged during [[ice age]]s but now are ice-free and occupied by streams or rivers. In [[desert]] areas, valleys may be entirely dry or carry a watercourse only rarely. In [[karst|areas of limestone bedrock]], [[dry valley]]s may also result from drainage now taking place [[cave|underground]] rather than at the surface. [[Rift valley]]s arise principally from [[tectonics|earth movements]], rather than erosion. Many different types of valleys are described by geographers, using terms that may be global in use or else applied only locally.
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