Summary: The border between the United States and Canada is the longest border between any two countries in the world. The total length of the land border is 8,891 kilometers or 5,525 miles long. In addition to being the longest border in the world, it is also the longest non-militarized and non-fenced border in the world. With a border that long, you are bound to have some oddities, and the US/Canadian border has plenty.
