2021 Map of Middle Mountains North

About this map

Mid Mountains provides a distinct topographic anchor in this arid region of the Southwest, where the desert floor transitions into the broad expanse of the Castle Dome Plain. The landscape is defined by the natural drainage patterns of ephemeral watercourses, most notably Indian Wash and the extensive Los Angeles Wash. This 2021 survey by the U.S. Geological Survey captures the modern jurisdictional boundary between La Paz and Yuma counties, showing how administrative lines intersect the physical geography of the basin and range province. The map serves as a detailed record of the desert's undeveloped stretches, emphasizing the network of washes that shape the terrain and influence local movement across this high-desert environment.