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 100,000 acres were listed for sale in Texas's Blanco County recently; the combined value of all Blanco County farms, ranches, hunting land and other land for sale was $815 million. Blanco County ranks 45th out of 254 counties in the Lone Star State for the total number of acres of land currently advertised for sale. There were three properties listed as sold in Blanco County through the Land Network Comparable Sales Program. This represented a total value of $2,301,175. Of all locations in Blanco County with farms, ranches, and rural real estate for sale, Blanco had the most land for sale. Based on its natural assets, Blanco County's economy is dependent on tourism and recreation. Blanco County is the 219th largest county (713 square miles) in Texas. It's located in the Hill Country South Texas region of the state.