Valley
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.
Fill tool-ing (again)
Valley River Sun Sky
I don't know what I was going to draw at firstvxD It was random fill strokes. Just tried to...