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Originally Posted by plaster
W
Still trying to figure out your source of dimensions. And wall is around 1000 miles... natural barriers make up the rest.
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Don't over tax your brain
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2,000 miles
Southern Barrier, Part 1. The United States' border with Mexico is nearly 2,000 miles long. Over that vast distance the protective barriers between the two countries vary greatly.
Southern US Border Barrier - U.S. Border Patrol
Southern US Border Barrier
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So, no one ever crosses a 'Natural Border' LOL
Hannibal marched an entire army over the Alps