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How long is 20 nautical miles?

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It's about one-and-two-fifths times as tall as Olympus Mons
In other words, the height of Olympus Mons is 0.710 times 20 nautical miles.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 15 nautical miles. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about two-fifths as long as The Panama Canal
In other words, 20 nautical miles is 0.420 times the length of The Panama Canal, and the length of The Panama Canal is 2.40 times that amount.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 48 nautical miles in length. Ships passing through the Canal are raised (and then lowered) 0.014 nautical miles above sea level through the lock-and-dam system.
It's about one-third as long as The English Channel
In other words, 20 nautical miles is 0.3460 times the length of The English Channel, and the length of The English Channel is 2.890 times that amount.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 57.80 nautical miles, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about one-third as long as The 405
In other words, 20 nautical miles is 0.317830 times the length of The 405, and the length of The 405 is 3.14630 times that amount.
(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 62.9270 nautical miles. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about three-tenths as long as Hadrian's Wall
In other words, 20 nautical miles is 0.310 times the length of Hadrian's Wall, and the length of Hadrian's Wall is 3.20 times that amount.
(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 65 nautical miles (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about three-and-a-half times as tall as The Challenger Deep (Marianas Trench)
In other words, 20 nautical miles is 3.39750 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 0.294330 times that amount.
(near Marianas Islands, a.k.a. Ladrones Islands, northwestern Pacific Ocean) (depth below sea level)
The Challenger Deep, at the southern end of the Marianas Trench, reaches a depth of 5.88660 nautical miles below sea level. There has been only one manned expedition to the bottom of Challenger Deep — a 1960 voyage that took 4 hours and 48 minutes to reach the bottom.
It's about three-and-a-half times as tall as Maxwell Montes
In other words, the height of Maxwell Montes is 0.290 times 20 nautical miles.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 5.90 nautical miles. Since Venus does not seem to have the kind of tectonic activity which gives rise to mountains on Earth, the origin of the Venusian mountain remains the subject of some dispute.