San Ygnacio sits prominently along the eastern bank of the Rio Grande, serving as the primary population center in this international border region. The landscape is defined by the convergence of several ephemeral waterways, such as Arroyo San Francisco and El Grullo Cr, which drain into the river and the northern reaches of the Falcon Reservoir. The town's layout is centered around local thoroughfares like Trevino St and Cemetery Ave, leading to several burial sites including the Uribe Cem and Cementerio del Pueblo. To the southeast, the smaller settlement of Ramireno is situated near the Arroyo Zacatoso, marked by its own New Ramireno Cem. The presence of the Corralitos Airport in the north and various ranch roads, including Sergio Gonzalez Ranch Rd, highlights the connectivity of this rural landscape despite its position along the rugged river boundary.
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1942 · San Ygnacio
USGS Topo · 1:62,500
1949 · Mc Allen
USGS Topo · 1:250,000
1954 · McAllen
USGS Topo · 1:250,000
1956 · Zapata
USGS Topo · 1:62,500
1956 · Laredo
USGS Topo · 1:250,000
1957 · Mc Allen
USGS Topo · 1:250,000
1962 · McAllen
USGS Topo · 1:250,000
1979 · Zapata
USGS Topo · 1:24,000
1979 · Zapata NW
USGS Topo · 1:24,000
1979 · San Ygnacio
USGS Topo · 1:24,000