Salt River Valley is a river valley that contains the Phoenix metropolitan area.
=== River valleys ===The development of a river valley is affected by the character of the bedrock over which the river or stream flows, the elevational difference between its top and bottom, and indeed the climate
=== Rift ===Rift valleys, such as the Albertine Rift and Gregory Rift are formed by the expansion of the Earth's crust due to tectonic activity beneath the Earth's surface

