Definition of Canada–united states border

Canada and the United States of America share the longest common border in the world. Officially known as the International Boundary, it is generally unmilitarized. 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 (5,522 mi) long, including 2,477 kilometres (1,539 mi) shared with Alaska.