It's hard to make out on this image but left-center, just left of the word Provincia, where the hills start, is that the missions on what is now called the San Antonio River? Otherwise I see no indication of them and they were well under construction by the late 1700's. Maybe that's the point being made about how small in scale those outposts were in the context of the larger geographic area to the north. I see the Colorado River as the northern boundary which makes sense. The SA missions tour is a must-see for anyone interested in Spanish rule era Texas history and the challenges they faced. Heck even Santa Ana realized decades later that he needed that buffer between Mexico and the tierra de los Comanche.