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How long is 390,000 ells?

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It's about as long as The Grand Canyon
In other words, the length of The Grand Canyon is 1 times 390,000 ells.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 390,000 ells 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 962 ells above the floor of Granite Gorge.
It's about one-third as long as The Rhine
In other words, 390,000 ells is 0.3380 times the length of The Rhine, and the length of The Rhine is 2.960 times that amount.
(a.k.a. Rhein, a.k.a. Rijn, a.k.a. Rhin, a.k.a. Rain, a.k.a. Reno, a.k.a. Rhenus, a.k.a. Ryn) (from near Reichenau, Switzerland through Hoek van Holland, Rotterdam, Netherlands)
The Rhine river runs 1,150,000 ells in total length. The World War II Battle of Arnhem, as memorialized in the 1974 book and 1977 movie A Bridge Too Far, was the first of several attempts to capture key bridges across the Rhine, beginning with the Arnhem Bridge in the Netherlands.
It's about three-and-a-half times as long as Hadrian's Wall
In other words, the length of Hadrian's Wall is 0.270 times 390,000 ells.
(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 100,000 ells (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 four times as long as The 405
In other words, 390,000 ells is 3.8250 times the length of The 405, and the length of The 405 is 0.261440 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 101,960 ells. 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 times as long as The English Channel
In other words, 390,000 ells is 4.170 times the length of The English Channel, and the length of The English Channel is 0.240 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 93,600 ells, 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 five times as long as The Panama Canal
In other words, 390,000 ells is 5.10 times the length of The Panama Canal, and the length of The Panama Canal is 0.20 times that amount.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 77,000 ells in length. Ships passing through the Canal are raised (and then lowered) 23 ells above sea level through the lock-and-dam system.
It's about one-fifth as long as The Colorado River
In other words, 390,000 ells is 0.1910 times the length of The Colorado River, and the length of The Colorado River is 5.240 times that amount.
(a.k.a. Aha Kwahwat, a.k.a. Grand River, a.k.a. Tizon River, a.k.a. Tecon River, a.k.a. Tison River) (from Grand Lake, Colorado through the Gulf of California)
The Colorado River runs 2,040,000 ells in length. Along this length, the river descends from its source, approximately 2,410 ells above sea level in the Rocky Mountains, to its mouth in the Gulf of California.