Old San Antonio Road

The Old San Antonio Road (sometimes called "El Camino Real" or "King's Highway") was a historic roadway located in the U.S. states of Texas and Louisiana. Parts of it were based on traditional Native American trails. Its Texas terminus was about 35 miles (56 km) southeast of Eagle Pass at the Rio Grande in Maverick County, and its northern terminus was at . The road continued from Texas through Monclova to Mexico City.

Louisiana Highway 6 mostly runs alongside the Old San Antonio Road for the entirety of its route through that state from to west of Many. State Highway 21 follows the old road to Midway, Texas, then State Highway OSR (for Old San Antonio Road) follows it around Bryan and College Station, and back to Highway 21 to the eastern outskirts of San Marcos. South of San Marcos, the road follows the Old Bastrop Road until it intersects with I-35. The road leaves the Interstate at New Braunfels and follows Solms road, then Nacogdoches Road, then Mission Road through San Antonio. South of San Antonio, the road follows Old Pleasanton Road, then varying local and county roads and merges with State Highway 97 to Cotulla. The road crosses private property and then follows State Highway 133 to Catarina. After Catarina, the road is on private property.

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