The central region of Texas covers the state's three largest cities: Houston, Dallas-Fort Worth and San Antonio. The limestone terrain of Texas Hill Country lies in Central Texas, as do the state's three largest rivers, the Trinity, the Brazos and the Colorado. The combined value of farms and ranches for sale in Texas's Robertson County recently on Land.com was nearly $144 million. This represents 100,000 acres of land and rural real estate for sale in Robertson County. Robertson County ranks 117th in Texas for the combined amount of land currently advertised for sale. Among cities in Robertson County with farms and ranches for sale, Franklin featured the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Texas. Robertson County is Texas's 188th biggest county (865 square miles). It's located in the Brazos Texas region of the state.