The Rio Grande defines the northern boundary of this landscape, carving a deep international border between the United States and Mexico. This 2019 survey documents a sparsely populated region where the river serves as the primary geographic feature, winding through the northern portion of the quadrangle. A significant section of the Amistad National Recreation Area is visible along the water, where the reservoir environment meets the desert terrain. The map's sparse labeling reflects the remote character of this borderland area, focusing on the topographic contours and the natural course of the waterway as it travels toward the Gulf.
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This is the sole edition of this map. No revisions or reprints were ever made.
1941 · Feely
USGS Topo · 1:62,500
1943 · Devils River
USGS Topo · 1:62,500
1944 · Devils River
USGS Topo · 1:62,500
1944 · Mouth Of Pecos
USGS Topo · 1:62,500
1958 · Del Rio
USGS Topo · 1:250,000
1964 · Del Rio
USGS Topo · 1:250,000
1972 · Amistad Dam
USGS Topo · 1:24,000
1972 · California Creek
USGS Topo · 1:24,000
1972 · Zuberbueler Bend
USGS Topo · 1:24,000
1972 · Box Canyon
USGS Topo · 1:24,000