Valleys are low areas between hills or mountains, often carved by the erosive action of rivers or glaciers. They are usually elongated with gently sloping sides and may contain fertile soil due to sediment deposition.
Related terms
Canyon: A deep valley with steep sides often created through erosion by rivers.
U-shaped Valley: A valley characterized by its wide "U" shape, usually formed by glaciers.
Floodplain: Flat land adjacent to a river channel that is periodically flooded with sediment-rich waters.