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. There was a combined almost $878 million of farms and ranches for sale in Williamson County, Texas, recently on Land.com. The total of all Williamson County farms, ranches, hunting land and other land for sale was 100,000 acres. Williamson County ranks 61st in the Lone Star State for the combined amount of land currently advertised for sale. Of all locations in Williamson County with farms and ranches for sale, Georgetown had the most land for sale. Williamson County is the 49th biggest county (1,134 square miles) in Texas. It's located in the Blacklands South Texas region of the state.