Mapping the Greater Great Lakes of North America

It is difficult to deny the greatness of the Great Lakes, which together form the largest aggregation of large lakes on the planet.  Although almost all sources include five lakes in this collection – Superior, Huron, Michigan, Erie, and Ontario – controversies persist. By geological criteria, Michigan and Huron form a single lake, reducing the number of Great Lakes to four. Yet some observers insist that there are actually six Great Lakes, adding Lake Champlain to the list. In 1998, the United States Congress went so far as to pass a bill giving Lake Champlain official Great Lakes status, thereby allowing the use of targeted Federal funding for the lake and its basin. The bill, however, generated considerable controversy, as Lake Champlain is much smaller than the “other” Great Lakes and is located at some distance from them. Co-chair of the Congressional Great Lakes Task Force Steven C. LaTourette denounced the maneuver, stating that ‘‘If Lake Champlain ends up as a Great Lake, I propose we rename it ‘Lake Plain Sham.” Soon afterward, Congress revised the designation, demoting Lake Champlain while retaining the funding opportunities.

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From a scientific perspective, however, there are good reasons to add a few other lakes to the list, all of which are located along the same great arc and all of which were created by similar geological processes. This idea is admirably explored in a YouTube video by Signore Galilei entitled “North America’s OTHER Forgotten ‘Great Lakes.’” Some of the lakes on Galilei’s list are large indeed: Canada’s Great Bear Lake and Great Slave Lake are both larger than Lake Erie and Lake Ontario and it’s lake Winnipeg is larger than Lake Ontario.

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I have depicted this great arc of lakes – the Greater Great Lakes of North America, if you will – on the map posted below.  Political boundaries have been removed to highlight the lakes themselves. To further defamiliarize the Great Lakes concept, I have rotated the frame, putting northeast at the top. As can easily be seen, this is indeed a great chain of lakes. It is also much more a feature of Canada than of the United States. Only one of lakes – Michigan – is wholly located in the United States. Five are shared between the two countries (Superior, Huron, Erie, Ontario, and Lake of the Woods). All the rest are entirely within Canada.

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