Lake Ontario (43°30'N, 78°00'W) is the eastern-most and smallest in surface area (7,340 square miles, 18,960 km²) of the Great Lakes, although it exceeds Lake Erie in volume (393 cubic miles, 1639 km³). It is the 14th largest lake in the world and has a shoreline 712 miles (1146 km) long.
Lake Ontario has an elevation of 243 feet (74 m) above sea level. Its length is 193 miles (311 km), and its breadth is 53 miles (85 km). The average depth is 283 feet (86 m), with a maximum depth of 802 feet (244 m). 1