Sebago Lake is the deepest and second largest lake in the U.S. state of Maine. The lake is 316 feet (96 m) deep at its deepest point, with a mean depth of 101 feet (31 m), covers about 45 square miles (117 km) in surface area, has a length of 12 miles (19 km) and a shoreline length of 105 miles (169 km). The surface is around 270 feet (82 m) above sea level, so the deep bottom is below the present sea level.