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The longest border between any two countries runs about 8,900 km, much of it unguarded and marked only by a thin cleared strip through the forest.
The US-Canada border stretches so long because it runs across an entire continent, from the Pacific coast through the Great Lakes to the Atlantic, plus a separate stretch between Alaska and Canada's territories, totaling roughly 8,900 kilometers. Because relations have been peaceful so long, much of this boundary passes through remote forests and prairies with minimal patrols, marked in places only by a cleared strip of land.
The Russia-China and India-China borders are both long and significant, but neither approaches this length, which benefits from spanning a wide continental stretch shared by only two nations.
This border is sometimes called the longest "undefended" border in the world, though modern security measures since the early 2000s have increased monitoring at official crossings.
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