Long divisions
Donald Trump reaffirmed his plan for a border wall between the US and Mexico, but said parts might end up as a fence. Who has the longest, highest barriers?
India-Bangladesh India is still building a 2,545-mile three-metre-high barrier of barbed wire and concrete.
Morocco-Western Sahara Separated by a 1,700-mile sand berm, typically two metres high, reinforced with land mines.
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