The U.S.-Canadian border is marked by a cleared line through a forest in the mountains near Sumas, Wash., and Abbotsford, British Columbia, Feb. 1, 2005.
From Blaine, Wash., at the western edge of the boundary, to Houlton, Maine, on the eastern end, the 4,000-mile northern border is a labyrinth of mountains, prairies and waterways.
(Photo: AP)
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