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.
Groundwater is typically closest to the Earth's surface in stream valleys due to the topography and geology of these areas. Water from streams can infiltrate into the ground, recharging the groundwater system and bringing it closer to the surface in these valley locations. This proximity to the surface in stream valleys makes them important areas for groundwater recharge and interactions between surface water and groundwater.
valleys
butt cheeks
Various mountains and hills are found almost everywhere, and between them are valleys. It is a ubiquitous geographical feature.
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
They were in fertile, well watered river valleys.
river valleys
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
Moshe Inbar has written: 'Yizreel and Harod valleys' -- subject(s): Bibliography, Geology
Glaciers