The frame-breaker shelf. US 90 and the Camino Real both keep going west of the Sabine, so the atlas follows them to the missions and stops. Texas is its own country; these two roads are the South's exit ramps into it.
The Beyond the Sabine has 3 back-roads routes, about 835 miles and 28 curated stops, and 1 ready-made itinerary uses them.
Also touches the Beyond the Sabine: Beyond the Sabine: El Camino to the Alamo
States: Texas. Browse the other regions: Gulf Coast · Deep South · Upper South · Atlantic Coast · Florida Peninsula · Ozarks, Ouachitas & the Bootheel.
3 back-roads routes, about 835 miles in all, with 28 curated stops. Every one follows two-lane highways instead of the interstate.
El Camino Real: The Texas Act at about 330 miles (San Augustine → San Antonio), a 3–4-day drive.
Hill Country: Austin to San Antonio the Long Way: about 175 miles, 2 days, Austin → San Antonio.
Its routes run through Texas.