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1990 Map of Southeast of Somerton

Name: 1990 Topographic Map of Southeast of Somerton
Creator: U.S. Geological Survey
Published: 1991
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1991

About this map

The international border between the United States of America and Mexico bisects this arid landscape, creating a stark visual divide between the Yuma Desert of Arizona and the Desierto de Altar in Sonora. To the north, the terrain is dominated by the western reaches of the Barry M Goldwater Air Force Range, marked by a network of 4wd tracks and infrastructure like a Substation and Borrow Pit.

South of the boundary line, the map transitions into Mexican territory, specifically within the Distrito de Riego Numero Catorce. This area is shaped by the presence of El Rio Colorado, where the environment shifts from desert flats toward the riparian and agricultural systems of the Colorado River delta. Technical features such as a Drill Hole, an Aqueduct, and scattered wells indicate the vital importance of water management in this harsh borderland during the late twentieth century.