sentences:  According to the U.S. Census Bureau, the city has a total area of , of which is land and , or 40.14%, is water.Guntersville is located at the southernmost point of the Tennessee River on Lake Guntersville, formed by the Guntersville Dam (built by the Tennessee Valley Authority).Geologically, the lake occupies a southern extension of Sequatchie Valley, which continues south as Browns Valley.