<P> The Canada -- United States border ( French : Frontière entre le Canada et les États - Unis ) , officially known as the International Boundary , is the longest international border in the world between two countries . It is shared between Canada and the United States , the second - and fourth - largest countries by area , respectively . The terrestrial boundary ( including portions of maritime boundaries in the Great Lakes , and on the Atlantic , Pacific , and Arctic coasts ) is 8,891 kilometres ( 5,525 mi ) long , of which 2,475 kilometres ( 1,538 mi ) is Canada 's border with Alaska . Eight Canadian provinces and territories ( Yukon , British Columbia , Alberta , Saskatchewan , Manitoba , Ontario , Quebec , and New Brunswick ) , and thirteen U.S. states ( Alaska , Washington , Idaho , Montana , North Dakota , Minnesota , Michigan , Ohio , Pennsylvania , New York , Vermont , New Hampshire , and Maine ) are located along the border . </P>
<P> The Canada -- United States border ( French : Frontière entre le Canada et les États - Unis ) , officially known as the International Boundary , is the longest international border in the world between two countries . It is shared between Canada and the United States , the second - and fourth - largest countries by area , respectively . The terrestrial boundary ( including portions of maritime boundaries in the Great Lakes , and on the Atlantic , Pacific , and Arctic coasts ) is 8,891 kilometres ( 5,525 mi ) long , of which 2,475 kilometres ( 1,538 mi ) is Canada 's border with Alaska . Eight Canadian provinces and territories ( Yukon , British Columbia , Alberta , Saskatchewan , Manitoba , Ontario , Quebec , and New Brunswick ) , and thirteen U.S. states ( Alaska , Washington , Idaho , Montana , North Dakota , Minnesota , Michigan , Ohio , Pennsylvania , New York , Vermont , New Hampshire , and Maine ) are located along the border . </P>
longest border in the world between two countries
longest border in the world between two countries
Canada -- United States border
Canada -- United States border