The Granite Mountains and the Palen Mountains dominate this arid landscape in eastern Riverside County, where the desert floor is shaped by shifting ephemeral watercourses. This 2018 survey illustrates the physical isolation of the region, defined largely by the natural corridor between these two ranges. Central to the map's geography is the Palen Pass Rd, a singular route that navigates the topographical gap and provides the primary east-west passage through the rugged interior. In the northeastern quadrant, Sand Draw marks a significant drainage feature, emphasizing the importance of alluvial patterns in this high-desert environment. The lack of permanent structures or developed townships highlights the area's preservation as a wilderness space, largely unchanged since the early township and range divisions of t2s r18e and t3s r18e were first established.
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This is the sole edition of this map. No revisions or reprints were ever made.
1942 · Blythe
USGS Topo · 1:250,000
1942 · Amboy
USGS Topo · 1:250,000
1943 · Amboy
USGS Topo · 1:250,000
1943 · Iron Mountains
USGS Topo · 1:62,500
1945 · Midland
USGS Topo · 1:62,500
1952 · Midland
USGS Topo · 1:62,500
1952 · Palen Mountains
USGS Topo · 1:62,500
1954 · Salton Sea
USGS Topo · 1:250,000
1954 · Needles
USGS Topo · 1:250,000
1954 · Rice
USGS Topo · 1:62,500