The Great Bear Lake (French: Grand lac de l'Ours) is the largest lake entirely in Canada (Lake Superior and Lake Huron straddling the Canada-US border are larger), the third largest in North America, and the seventh largest in the world. French: Grand lac de l'Ours) is the largest lake entirely in Canada (Lake Superior and Lake Huron straddling the Canada-US border are larger), the third largest in North America, and the seventh largest in the world.