South Texas is typically classified as the area between the San Antonio metro area and south to the Rio Grande and Gulf of Mexico. Land for sale in Texas's Bexar County recently totaled around $909 million and almost 100,000 acres. Bexar County ranks 14th in the Lone Star State for the combined amount of land currently advertised for sale. San Antonio featured the most land for sale. Bexar County is the 37th largest county (1,256 square miles) in Texas. It's located in the San Antonio Texas region of the state.