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 overall value of ranches, farms, hunting land and other rural land and acreage for sale in Texas's Travis County recently on Land.com was almost $1 billion. This represents 7,000 acres of farms and ranches for sale in Travis County. Travis County ranks 26th in the Lone Star State for the combined amount of land currently advertised 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 Texas's 75th largest county (1,023 square miles). It's located in the Blacklands South Texas region of Texas.