Valley
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A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land
The valley of Halikko River in Halikko, Finland
Valley of Palakaria River springing from Vitosha Mountain, seen in the background, in Bulgaria
U-shaped valley on the Afon Fathew near Dolgoch, Wales
A glaciated valley in the Mount Hood Wilderness showing a characteristic U-shape, the bottom's rocky 'rubble' accretion and the broad shoulders
River
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A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before r
A boat floats on the Mekong in Laos
Melting toe of the Perito Moreno Glacier in Los Glaciares National Park, Argentina
The Grand Canyon was carved by the Colorado River.
The Nile in Egypt is known for its fertile floodplains, which flood annually.