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 almost 100,000 acres were listed for sale in Robertson County, Texas, recently; the combined value of all Robertson County farms, ranches, and rural real estate for sale was almost $158 million. Robertson County ranks 114th out of 254 counties in the Lone Star State for the total acreage of land currently advertised for sale. There were three properties listed as sold in Robertson County through the Land Network Comparable Sales Program. This represented a total value of $1,480,000. Of all farms and ranches for sale in Robertson County, 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.