Border irregularities of the United States

Border irregularities of the United States, particularly panhandles and highway incursions into other jurisdictions, are shown here.

[5] Canada relies on the "A-B" Line as rendering nearly all of Dixon Entrance as Canadian internal waters.

The U.S. regards the waters as subject to international marine law, and in 1977 it defined an equidistant territorial sea throughout Dixon Entrance.

Another disputed area is the Grey Zone, including Machias Seal Island, in the Gulf of Maine.

The Aroostook Valley Country Club is a golf course which straddles the Canada–US border, between the U.S. state of Maine and the Canadian province of New Brunswick.

The club, located near Perth-Andover, New Brunswick and Fort Fairfield, Maine, has its course (except part of the tee area for the ninth hole, and possibly part of a sand trap on the first hole) and clubhouse on the Canadian side of the border and its parking lot and pro shop on the American side.

The Northwest Angle in Minnesota, bordering Manitoba , Ontario , and Lake of the Woods
State border of Ellis Island after New Jersey v. New York , 1998. Green is the area of the original natural island, part of New York City, New York, while the man-made rest of the island is part of Jersey City, New Jersey
Kentucky Bend and surrounding area
Missouri (MO)
Tennessee (TN)
Kentucky (KY)