The North American Great Lakes are unique among the world's large lakes in that their basins are linked together and form one continuous drainage basin. Together, they constitute the greatest freshwater system on Earth. Starting in Lake Superior, the water flows out the lake's southeastern tip down the St. Marys River into Lakes Michigan and Huron, which actually are two halves of one lake.
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The North American Great Lakes are unique among the world's large lakes in that their basins are linked together and form one continuous drainage basin. Together, they constitute the greatest freshwater system on Earth. Starting in Lake Superior, the water flows out the lake's southeastern tip down the St. Marys River into Lakes Michigan and Huron, which actually are two halves of one lake.
http://www.seagrant.wisc.edu/communications/greatlakes/GlacialGift/
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