Canada–United States border

"International Boundary" redirects here. For other boundaries between nations, see border.

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, 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
The Peace Arch at the border between Surrey, British Columbia, and Blaine, Washington
Characteristics
Entities	Canada 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 American War of Independence
Current shape	April 11, 1908 Treaty of 1908
Treaties	Treaty of Paris Jay Treaty Treaty of 1818 Webster–Ashburton Treaty Oregon Treaty
Notes	See list of current disputes

The Peace Arch at the border between Surrey, British Columbia, and Blaine, Washington

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