Location and flow
The Nueces rises northwest of San Antonio in the Edwards Plateau, in Real County, roughly 50 mi (80 km) north of Uvalde. It flows south through the Texas Hill Country, past Barksdale and Crystal City, approaching to within 35 mi (56 km) of the Rio Grande on the border with Mexico. East of Carrizo Springs, it turns to the east, flowing through the scrub plains of South Texas, across rural Dimmit, La Salle, and McMullen Counties. In central Live Oak County, it is joined from the northwest at Three Rivers by the Atascosa River and Frio River, then flows southeast along the coastal plain past Mathis, where it is impounded to form the Lake Corpus Christi reservoir. It enters Corpus Christi Bay on the Gulf of Mexico at Corpus Christi.