What two countries have the largest unguarded border?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

United States and Canada
2 people found this useful

Which is the second largest border between two countries in the world?

Either Kazakhstan/Russia or Chile/Argentina... No one has ever took the time to measure...probaly because nobody wants to go to Chile, Argentina, Russia or Kazakhstan....nah,