
The Rio Grande snakes across the northern corner of this terrain in Starr County, defining the international boundary between the United States of America and Estados Unidos Mexicanos. This 2022 survey focuses on a largely undeveloped stretch of the borderlands, where the landscape is shaped by the wandering hydrology of the river and the complex network of ephemeral drainage patterns that feed into it. The lack of dense settlement or established infrastructure on this specific sheet highlights the arid, open character of the border region northwest of Los Ebanos. Researchers can study the contemporary course of the river and the intricate topography of the surrounding basins as they appeared in the early 2020s, providing a modern baseline for understanding the physical geography of this international frontier.
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This is the sole edition of this map. No revisions or reprints were ever made.
1949 · Mc Allen
USGS Topo · 1:250,000
1954 · McAllen
USGS Topo · 1:250,000
1956 · Garcias
USGS Topo · 1:62,500
1956 · Los Ebanos
USGS Topo · 1:62,500
1956 · Escobares
USGS Topo · 1:62,500
1957 · Mc Allen
USGS Topo · 1:250,000
1962 · McAllen
USGS Topo · 1:250,000
1965 · Rio Grande City South
USGS Topo · 1:24,000
1965 · La Grulla
USGS Topo · 1:24,000
1965 · Sullivan City
USGS Topo · 1:24,000