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Wikipedia

Canada–United States border

The Canada–United States border is the longest international border in the world.[a] The boundary (including boundaries in the Great Lakes, Atlantic, and Pacific coasts) is 8,891 km (5,525 mi) long. The land border has two sections: Canada's border with the contiguous United States to its south, and with the U.S. state of Alaska to its west. The bi-national International Boundary Commission deals with matters relating to marking and maintaining the boundary, and the International Joint Commission deals with issues concerning boundary waters. The agencies responsible for facilitating legal passage through the international boundary are the Canada Border Services Agency (CBSA) and U.S. Customs and Border Protection (CBP).

Canada–United States border
Characteristics
Entities Canada
 United States
Length8,891 km (5,525 mi)
History
EstablishedSeptember 3, 1783
Signing of the Treaty of Paris at the end of the American War of Independence
Current shapeApril 11, 1908
Treaty of 1908
Treaties
NotesSee list of current disputes