A
valley is a low area between hills, often with a river running through it. In
geology, a
valley or
dale is a
depression that is longer than it is wide. The terms
U-shaped and V-shaped are descriptive terms of
geography to characterize the form of valleys. Most valleys belong to one of these two main types or a mixture of them, (at least) with respect of the
cross section of the slopes or hillsides.