sentences:  These two physiographic features have unique characteristics that account for wide variations in the county's climate.According to the U.S. Census Bureau, the county has a total area of 375 square miles (970 km2), of which 373 square miles (970 km2) is land and 2.2 square miles (5.7 km2) (0.6%) is water.The county's largest body of water is Lake Summit, a reservoir impounded by the Duke Power Company for hydroelectric generation.