List of areas disputed by Canada and the United States

Download coordinates as: Canada and the United States have one land dispute over Machias Seal Island (off the coast of Maine), and four other maritime disputes in the Arctic and Pacific.

The two countries share the longest international border in the world and have a long history of disputes about the border's demarcation (see Canada–United States border).

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Maps of the Dixon Entrance showing the A-B Line of 1903 [ 6 ] [ 7 ] [ 10 ] (left) and the boundary currently claimed by the U.S. [ 11 ] (right).