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 combined approximately 100,000 acres were listed for sale in Hamilton County recently; the combined value of all Hamilton County farms, ranches, hunting land and other land for sale was almost $231 million. Hamilton County ranks 85th in Texas for the total acreage 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 $1,750,001. Of all land for sale in Hamilton County, Hamilton featured the most land for sale. Its economy is defined as agricultural, with 1,001 farms recorded in the county during the most recent U.S. Census. Farming activities in Hamilton County generate annual revenues of $1 million, the majority of which comes from livestock products. Hamilton County is the 195th biggest county (836 square miles) in Texas. It's located in the Hill Country North Texas region of the state.