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The International Boundary between Canada and the US runs through four of the five Great Lakes.

In addition, the Boundary runs through Lake of the Woods, Rainy Lake, Lake St Clair, approximately 40 smaller lakes in the Quetico region, and a dozen or so smaller lakes in the St Croix and St John River systems.
I believe six lakes.

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In addition to four of the five Great Lakes, the International Boundary runs through Lake of the Woods, Rainy Lake, Lake St Clair, and approximately 40 smaller lakes in the Quetico area.

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