What is Canada–United States border?
{{redirect|International Boundary|other boundaries between nations|border}}{{Infobox border|name=Canada–United States border|image=Peace Arch, U.S.-Canada border.jpg|caption=The [[Peace Arch]] at the border between [[Surrey, British Columbia]], and [[Blaine, Washington]]|territory1={{flag|Canada}}<br />{{flag|United States}}|length={{convert|8,891|km|mi|0|abbr=on}}|established=September 3, 1783|establishedreason=Signing of the [[Treaty of Paris (1783)|Treaty of Paris]] at the end of the [[American Revolutionary War|American War of Independence]]|current=April 11, 1908|currentreason=[[#Treaty of 1908|Treaty of 1908]]|treaties={{plainlist| *[[Treaty of Paris (1783)|Treaty of Paris]] *[[Jay Treaty]] *[[Treaty of 1818]] *[[Webster–Ashburton Treaty]] *[[Oregon Treaty]] }}|notes=[[List of areas disputed by Canada and the United States|''See list of current disputes'']]}}[[File:Peacearchuscanadaborder.JPG|thumb|200px|right|The [[Peace Arch]] at the border between [[Surrey, British Columbia]], and [[Blaine, Washington]]]] [[File:Canada US pipeline border.jpg|thumb|200px|right|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 [[border]] of the [[United States]] and [[Canada]], called the '''Canada–United States border''' or 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 Ocean|Atlantic]], [[Pacific Ocean|Pacific]], and [[Arctic Ocean|Arctic]] coasts, as well as the [[Great Lakes]]) is {{convert|8,891|km|mi|0}} long, including {{convert|2,475|km|mi|0}} shared with [[Alaska]]. It is Canada's only [[List of land border lengths|land border]]. {{Multistub|Canada|US-geo}} [[Category:Geography of Canada]] [[Category:Borders of the United States]]