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The Strait of Gibraltar, as seen from the space shuttle Endeavour during NASA's STS-77 mission, May 1996. Spain is on the right and Morocco on the left, with the Atlantic Ocean at the top and the Mediterranean at the bottom. There are only eight miles of water between the two countries at the strait's narrowest point. (Photo by Space Frontiers/Getty Images)

The Strait of Gibraltar, as seen from the space shuttle Endeavour during NASA's STS-77 mission, May 1996. Spain is on the right and Morocco on the left, with the Atlantic Ocean at the top and the Mediterranean at the bottom. There are only eight miles of water between the two countries at the strait's narrowest point. (Photo by Space Frontiers/Getty Images)