Superior: 2,900 miles cubed of water or 12,100 km cubed
Michigan: 1,180 miles cubed or 4,920 km cubed
Huron: 850 miles cubed or 3,540 km cubed
Erie: 116 miles cubed or 484 km cubed
Ontario: 393 miles cubed or 1,640 km cubed
The great lakes contain almost 21% of the world’s freshwater supply. Only the glacial ice caps at the poles have more water. As a whole, the great lakes hold roughly 5,500 cubic miles of water.
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