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How long is 315,000 feet?

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It's about one-and-one-tenth times as long as The Panama Canal.
In other words, the length of The Panama Canal is 0.910 times 315,000 feet.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 290,000 feet in length. Ships passing through the Canal are raised (and then lowered) 85 feet above sea level through the lock-and-dam system.
It's about nine-tenths as long as The English Channel.
In other words, 315,000 feet is 0.8970 times the length of The English Channel, and the length of The English Channel is 1.110 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 351,000 feet, 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 four-fifths as long as The 405.
In other words, 315,000 feet is 0.823850 times the length of The 405, and the length of The 405 is 1.21380 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 382,350 feet. 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 four-fifths as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 1.30 times 315,000 feet.
(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 390,000 feet (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 Olympus Mons.
In other words, the height of Olympus Mons is 0.280 times 315,000 feet.
(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 89,000 feet. 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 one-fifth as long as The Grand Canyon.
In other words, 315,000 feet is 0.2150 times the length of The Grand Canyon, and the length of The Grand Canyon is 4.650 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 1,460,000 feet along the course of the Colorado River at its bottom. Having opened in early 2007, the Grand Canyon Skywalk allows tourists to stand on a horseshoe-shaped glass walkway 3,610 feet above the floor of Granite Gorge.
It's about eight-and-a-half times as tall as Maxwell Montes.
In other words, the height of Maxwell Montes is 0.110 times 315,000 feet.
(Ishtar Terra, Venus)
Maxwell Montes rises to a total height of 36,000 feet. 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.