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The Great Lakes and the St Lawrence River (including St Marys River, St Clair River, Lake St Clair, Detroit River and Niagara River) are the most obvious physical boundaries, but the Strait of Juan de Fuca and Georgia Strait constitute another physical boundary. The St John and the St Croix Rivers also form part of the boundary, as do the Pigeon River, Rainy River, Rainy Lake, Lake of the Woods, and approximately 40 smaller lakes in the Quetico region.

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