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Deserts were not a major economic feature of river valleys. People living in the river valleys relied heavily on agriculture.
In many cases, rivers are responsible for cutting valleys and canyons.
butt cheeks
valleys
Various mountains and hills are found almost everywhere, and between them are valleys. It is a ubiquitous geographical feature.
Coastal geology studies coastal processes which affect the geology in coastal regions. Some coastal processes are effects of hurricanes, incised valleys, river migration, sedimentation, barrier island systems, estuaries, deltas, etc.
Joseph Edwin Upson has written: 'Bedrock valleys of the New England coast as related to fluctuations of sea level' -- subject(s): Geology, Geology, Stratigraphic, New England, Stratigraphic Geology
Paul Lewis Heller has written: 'Pleistocene geology and related landslides in the lower Skagit and Baker Valleys, North Cascades, Washington' -- subject(s): Geology, Stratigraphic, Glacial epoch, Stratigraphic Geology
They were in fertile, well watered river valleys.
river valleys
Rivers,mountains, and valleys are examples of physical features
Moshe Inbar has written: 'Yizreel and Harod valleys' -- subject(s): Bibliography, Geology