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0.000164 shackles is about 0.00000005 times as long as The Panama Canal.
In other words, it's 0.0000000510 times the length of The Panama Canal, and the length of The Panama Canal is 20,000,000 times that amount.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 3,200 shackles in length. Ships passing through the Canal are raised (and then lowered) 0.950 shackles above sea level through the lock-and-dam system.
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