Canyon
Videos
A canyon, gorge or chasm, is a deep cleft between escarpments or cliffs resulting from weathering and the erosive activity of a river over geologic time scales. Rivers have a natural tendency to cut t
Grand Canyon, Arizona, at the confluence of the Colorado River and Little Colorado River.
Sumidero Canyon, Mexico
Kevo Canyon in Utsjoki, Finland
Snake River Canyon, Idaho
Valley
Videos
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