Canada–United States border

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A Royal Canadian Mounted Police constable and a state trooper before the official ceremony commemorating the joining of the Portland–Montreal Pipe Line 1 August 1941

The CanadaUnited States border, officially known as the International Boundary, is the longest international border in the world shared between the same pair of countries. The terrestrial boundary (including small portions of maritime boundaries on the Atlantic, Pacific, and Arctic coasts, as well as the Great Lakes) is 8,891 kilometres (5,525 mi) long, including 2,475 kilometres (1,538 mi) shared with Alaska. It is Canada's only land border.