How Much of the U.S. Could the Great Lakes Cover?

The Great Lakes span approximately 94,600 square miles (245,000 square kilometers). While that sounds enormous, the United States covers roughly 3.8 million square miles—meaning the lakes would cover only about 2.5% of the country's total land area.

Put differently: you could fit the entire Great Lakes system into the U.S. about 40 times over. Still, these five interconnected lakes—Superior, Michigan, Huron, Erie, and Ontario—hold roughly 21% of the world's surface freshwater, making them a globally significant resource despite their modest footprint on the map.