most of the lakes in the north central united states exist as a result of
Great Lakes Five lakes in central North America, between Canada and the USA; the world's largest expanse of freshwater. They are (from w to e): Lakes Superior, Michigan, Huron, Erie, and Ontario.arved by ancient glaciers, these lakes contain approximately 20 percent of the world's surface fresh-water supply and 95 percent of the surface fresh water in the United States. The Great Lakes waterbody is so large that its natural features can be seen from the Moon.