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 total of $164 million of farms, ranches, and rural real estate for sale in Texas's Robertson County recently on Land.com. The total of all Robertson County farms and ranches for sale was nearly 100,000 acres. Robertson County ranks 110th in the Lone Star State for the total acreage of land currently advertised for sale. There were nine properties listed as sold in Robertson County through the Land Network Comparable Sales Program. This represented a total value of $5,508,108. Franklin had the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Texas. Robertson County is the 188th biggest county (865 square miles) in Texas. It's located in the Brazos Texas region of the state.