Map Showing Names and Outlines of Physiographic Areas in Arizona Used by the Arizona Geological Survey with Comprehensive Base Map

The primary criteria for selection of boundaries are geology and topography, in a few instances political boundaries were used 2) The lower Colorado River Valley extends along the Colorado River from Hoover Dam to the U.S -Mexican border; it also Includes the lowland areas along the Colorado River such as Mohave Valley and Clbola Valley, which are delineated by dashed lines and considered subdivisions of the Lower Colorado River Valley.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu