South Texas is typically classified as the area between the San Antonio metro area and south to the Rio Grande and Gulf of Mexico. A total of almost 100,000 acres were listed for sale in Texas's Hidalgo County recently; the overall value of all Hidalgo County farms and ranches for sale was around $507 million. Hidalgo County ranks 13th out of 254 counties in the Lone Star State for the total acreage of land currently advertised for sale. Edinburg had the most land for sale. Hidalgo County is Texas's 18th biggest county (1,582 square miles). It's located in the Lower Rio Grande Valley Texas region of Texas.