The Longest Undefended Border

The World's Longest Undefended Border

The 8,891-kilometre (5,525-mile) border between Canada and the United States stands as the longest undefended international boundary in the world – a powerful symbol of the peace and friendship between our nations.

This remarkable border stretches from the Atlantic to the Pacific and through to the Arctic Ocean, crossing diverse landscapes from forests and plains to the Great Lakes and remote wilderness areas. Despite its length, it remains largely unguarded by military forces.

While both countries maintain border inspection points for controlling immigration and customs, the border has been free of military fortifications since the end of the War of 1812, more than 200 years ago.

The Rush-Bagot Treaty of 1817 began demilitarizing the Great Lakes region, and over time, both nations developed a mutual trust that has allowed this unique international boundary to exist without military presence.

The undefended nature of the border reflects a deep level of trust and cooperation that has developed over generations. Even as security measures have increased in recent decades, particularly after the September 11 attacks, the Canada-US border remains a model for peaceful international relations.

This enduring peace between neighbours is something both Canadians and Americans can be proud of – a testament to our shared values and commitment to resolving differences through dialogue rather than force.