What is traditionally known as the world’s longest undefended border? The answer: the border between Canada and the United States. Stretching over 8,800 kilometres, it’s the longest international border on the planet.

What makes it truly unique is that there are no military defenses along its entire length - a powerful symbol of the peaceful relationship and close cooperation between the two countries.

This fact often appears in Canadian Citizenship Test preparation, especially in geography or history sections. It’s a reminder that Canada’s identity is shaped not just by land - but by diplomacy and peaceful partnerships.