The Tinajas Altas Mountains dominate this arid landscape on the border of Arizona and Sonora, Mexico. This environment is characterized by critical desert water sources and natural transit corridors, most notably the Tinajas Altas rock tanks which have historically served as a vital life-sustaining resource in one of North America's driest regions. The topography centers on the Tinajas Altas Pass, a strategic gap in the granite range that has funneled travelers and migrants through the desert for centuries. Drainage patterns like Coyote Wash and isolated features such as Surveyors Tank further define the hydrology of this remote borderland territory.
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1942 · Yuma
USGS Topo · 1:250,000
1953 · Ajo
USGS Topo · 1:250,000
1954 · El Centro
USGS Topo · 1:250,000
1955 · El Centro
USGS Topo · 1:250,000
1957 · Ajo
USGS Topo · 1:250,000
1958 · Ajo
USGS Topo · 1:250,000
1958 · El Centro
USGS Topo · 1:250,000
1961 · El Centro
USGS Topo · 1:250,000
1962 · Ajo
USGS Topo · 1:250,000
1963 · Ajo
USGS Topo · 1:250,000