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Great Lakes Basin

Defined in 2 places of the United States Code.

The term "Great Lakes Basin" means the air, land, water, and living organisms in the United States within the drainage basin of the Saint Lawrence River at and upstream from the point at which such river and the Great Lakes become the international boundary between Canada and the United States.

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the term “Great Lakes Basin” means the air, land, water, and living organisms within the drainage basin of the Saint Lawrence River at or upstream from the point at which the river becomes the international boundary between Canada and the United States;

Source