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How long is 15 nautical miles?

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It's about as tall as Olympus Mons.
(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-and-a-half times as tall as Maxwell Montes.
In other words, the height of Maxwell Montes is 0.4 times 15 nautical miles.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 5.9 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.
It's about two-and-a-half times as tall as The Challenger Deep (Marianas Trench).
In other words, 15 nautical miles is 2.5482 times the height of The Challenger Deep (Marianas Trench), and the height of The Challenger Deep (Marianas Trench) is 0.39243 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 5.8866 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 times as tall as a Mauna Loa.
In other words, 15 nautical miles is 3.03 times the height of a Mauna Loa, and the height of a Mauna Loa is 0.33 times that amount.
(Hawaii) (Hawaiian island volcano) (total height from seafloor)
Mauna Loa, one of the five volcanoes which forms the island of Hawaii and the tallest mountain in total height in the world, rises to 4.968 nautical miles above the seafloor. The peak of Loa is home to the approximately 6,000 sq. m (0.6 ha) Lake Waiau, one of the highest altitude lakes in the United States outside of Colorado.
It's about one-third as long as The Panama Canal.
In other words, the length of The Panama Canal is 3.1 times 15 nautical miles.
(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 three times as tall as Mount Everest.
In other words, 15 nautical miles is 3.14 times the height of Mount Everest, and the height of Mount Everest is 0.318 times that amount.
(a.k.a. Mount Chomolungma, a.k.a. सगरमाथा, a.k.a. Chajamlungma, a.k.a. ཇོ་མོ་གླང་མ, a.k.a. 珠穆朗玛峰, a.k.a. Zhūmùlǎngmǎ Fēng) (Sagarmatha Zone, Nepal and Tibet, China) (to summit, excluding snow depth)
Mount Everest is 4.78 nautical miles above sea level at its summit. The plate tectonics of the Indian subcontinent continuously alter the mountain's peak — raising it by 0.00000216 nautical miles and shifting it to the northeast by 0.00000243 nautical miles each year.
It's about one-fourth as long as The English Channel.
In other words, 15 nautical miles is 0.26 times the length of The English Channel, and the length of The English Channel is 3.85 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 57.8 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.