Part of Lake Lanier is in the southeastern part of the county and the boundary lines with neighboring counties pass through the lake. The 729-ft (222-m) Amicalola Falls, are located in the county. The Amicalola Falls are the highest in Georgia, the tallest cascading waterfall east of the Mississippi River, and one of the Seven Natural Wonders of Georgia. The highest point in the county is Black Mountain, with an elevation of . The Chestatee and Etowah Rivers flow through Dawson County.