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. A total of around 7,000 acres were listed for sale in Travis County recently, representing a combined approximately $1 billion in Travis County farms, ranches, and rural real estate for sale. Travis County ranks 26th in the Lone Star State for the total acreage of land currently advertised for sale. There were three properties listed as sold in Travis County through the Land Network Comparable Sales Program. This represented a total value of $4,439,000. Of all locations in Travis County with farms, ranches, and rural real estate for sale, Austin had the most land for sale. Government and state-level services are the main economic drivers in Travis County. Travis County is the 75th biggest county (1,023 square miles) in Texas. It's located in the Blacklands South Texas region of Texas.