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. Land for sale in Williamson County recently totaled nearly $1 billion and nearly 100,000 acres. Williamson County ranks 51st out of 254 counties in the Lone Star State for the combined amount of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Williamson County, Georgetown featured the most land for sale. Williamson County is the 49th largest county (1,134 square miles) in Texas. It's located in the Blacklands South Texas region of the state.