Lake Superior.

The severe winters on North America’s largest body of freshwater echo the Ice Age, when glaciers helped gouge the Great Lakes. At times their waters drained into the Gulf of Mexico via the Mississippi River system, or reached the Atlantic through the Susquehanna or Hudson. Now the lakes empty through the St. Lawrence River.

National Geographic - August, 1973

Lake Superior.

The severe winters on North America’s largest body of freshwater echo the Ice Age, when glaciers helped gouge the Great Lakes. At times their waters drained into the Gulf of Mexico via the Mississippi River system, or reached the Atlantic through the Susquehanna or Hudson. Now the lakes empty through the St. Lawrence River.

National Geographic - August, 1973

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