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Donald Trump promised to build a wall along the US-Mexico border during the 2016 campaign. The wall, at 3,201 km, would be one of the longest in the world, but so far no funding has been allotted. If it is completed, the 'Trump Wall' would certainly be a sizable entry in Wikipedia's list of notable walls, but it would still be under half the length of the longest wall ever: unsurprisingly the Great Wall of China, at 8,850 km. But what about fences? The longest fence is, at 5,614 km, the Dingo Fence. It was constructed in the late 1800s to keep dingoes away from farm animals in the fertile southeast of the country.
Bonus:
Speaking of walls, if one wanted to up the ante, they could include the Hercules-Corona Borealis Great Wall, a cosmic mass of galaxies measuring 10 billion light years, or 10,000,000,000,000,000,000 times the length of the Great Wall of China. In addition to being the biggest 'wall', the Hercules-Corona Borealis Great Wall is the biggest...well...anything.
-E
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