I am the longest international border in the world, but I am not a river. I separate two large nations and often see friendly exchanges. What am I?
Category: Geography · Difficulty: hard
Hint: Think of two countries that share a vast land border in North America.
Answer
U.S.-Canada border
Explanation
The Canada-United States border is the longest international border in the world.
This is a hard geography riddle — a tricky one that takes a little thought. The answer is U.S.-Canada border.
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