"A valley is a low area between hills or mountains typically with a river running through it. In geology, a valley or dale is a depression ...
[Read more]
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 to the cross section of the slopes or hillsides." - (en.wikipedia.org 01.12.2019)
