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 Hamilton County recently, representing a combined nearly $220 million in Hamilton County farms and ranches for sale. Hamilton County ranks 90th out of 254 counties in Texas for the total number of acres of land currently advertised for sale. There were four properties listed as sold in Hamilton County through the Land Network Comparable Sales Program. This represented a total value of $6,389,000. Among cities in Hamilton County with land and rural real estate for sale, Hamilton featured the most land for sale. Agriculture and farming drives the Hamilton County economy, with 1,001 farms recorded in the county during the U.S. Census in 2012. Farming activities in Hamilton County generate annual revenues of $1 million, the majority of which comes from livestock products. Hamilton County is the 195th largest county (836 square miles) in Texas. It's located in the Hill Country North Texas region of Texas.