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How long is 816 miles?

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It's about three-tenths as long as The Distance from L.A. to New York.
In other words, 816 miles is 0.2920 times the length of The Distance from L.A. to New York, and the length of The Distance from L.A. to New York is 3.420 times that amount.
(Los Angeles, California to New York City, New York) (via I-10 E, I-15 N, I-70 E, I-76 E, I-80 E, I-280 E)
The total length of the freeway route from Los Angeles, California to New York City, New York via Interstate 80 is 2,790 miles long. This route intersects eleven states and several major cities, including Las Vegas, Nevada; Denver, Colorado; Lincoln, Nebraska; Omaha, Nebraska; Des Moines, Iowa; South Bend, Indiana; and Cleveland, Ohio.
It's about three-tenths as long as I-80.
In other words, 816 miles is 0.2831430 times the length of I-80, and the length of I-80 is 3.531780 times that amount.
(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 2,881.940 miles. A 37.28230 miles stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about one-fifth as long as The Great Wall of China (wall only).
In other words, 816 miles is 0.20980 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 4.7660 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 3.8890 miles. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-fifth as long as The Amazon River.
In other words, 816 miles is 0.2040 times the length of The Amazon River, and the length of The Amazon River is 4.9020 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 4,000 miles. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about one-tenth as long as The Great Wall of China (total).
In other words, 816 miles is 0.1480 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 6.760 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 5,500 miles. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-tenth as long as The Diameter of Earth.
In other words, 816 miles is 0.102947360 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 9.71370220 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 7,926.38060 miles at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1942 by the United States Army, which reached an altitude of 65 miles.
It's about eleven times as long as Hadrian's Wall.
In other words, the length of Hadrian's Wall is 0.091 times 816 miles.
(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 75 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.