Canada–United States border
The border of the Canada and United States, 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, 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.
| Canada–United States border | |
|---|---|
 | |
| Characteristics | |
| Entities |  Canada22x20px United States |
| Length | 8,891 km (5,525 mi) |
| History | |
| Established | September 3, 1783 Signing of the Treaty of Paris at the end of the U.S War of Independence |
| Current shape | April 11, 1908 Treaty of 1908 |
| Treaties | |
| Notes | See list of current disputes |
Canada–United States Border Media
US and Canadian border security working together at Vancouver International Airport
- 45th parallel US Canada.svg
The 45th parallel (marked in red) was established as a border between the Province of Quebec and the United States in the Treaty of Paris, following the line of a 1763 declaration by King George III.
- Amédée Forestier - Signing of Treaty of Ghent (1814).jpg
Signing of the Treaty of Ghent in 1814, which ended the War of 1812 and returned the border to its pre-war state. Subsequent treaties agreed upon saw the border demilitarized, and most boundary disputes resolved.
Disputed territory between British North America and Maine marked in pink. The dispute was settled in the Webster–Ashburton Treaty in 1842. The green line on the map marks the final border.
- Oregoncountry.png
Map of the disputed Oregon Country, with the American and British claims marked. The dispute was settled in the Oregon Treaty, placing the boundary along the 49th parallel, excluding Vancouver Island.
- Poker Creek–Little Gold Creek Border Crossing 2021.jpg
The Poker Creek–Little Gold Creek Border Crossing at the Alaska–Yukon border closed as a result of the COVID-19 pandemic.
- Greater USA (+Canada+Greenland+Panama Canal Zone).svg
A proposal to shift all of the northern U.S. boundary to the Arctic by President Trump
- US-Canada border counties.png
U.S. counties (or county equivalents) sharing a land or water border with Canada Land border Water border only
- North West Angle border 4.JPG
Canadian border crossing sign with lights to alert those crossing to report to customs remotely. Remote customs exist in areas where staffed border crossings are unavailable.
