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How long is 2,800,000,000 barleycorns?

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It's about two-and-a-half times as long as The Great Wall of China (total).
In other words, 2,800,000,000 barleycorns is 2.680 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 0.3730 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 1,050,000,000 barleycorns. 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 three-and-a-half times as long as The Amazon River.
In other words, 2,800,000,000 barleycorns is 3.6830 times the length of The Amazon River, and the length of The Amazon River is 0.27150 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 760,300,000 barleycorns. 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 four times as long as The Great Wall of China (wall only).
In other words, 2,800,000,000 barleycorns is 3.7880 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 0.2640 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 739,300 barleycorns. 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 five times as long as I-80.
In other words, 2,800,000,000 barleycorns is 5.111370 times the length of I-80, and the length of I-80 is 0.1956420 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 547,799,000 barleycorns. A 7,086,610 barleycorns 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 five-and-a-half times as long as The Distance from L.A. to New York.
In other words, 2,800,000,000 barleycorns is 5.280 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 0.1890 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 530,000,000 barleycorns 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 six-and-a-half times as long as The Mississippi River.
In other words, 2,800,000,000 barleycorns is 6.2950 times the length of The Mississippi River, and the length of The Mississippi River is 0.15890 times that amount.
(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 444,800,000 barleycorns. Prior to the development of soil erosion programs, the Mississippi River would carry approximately 400 million metric tons of sediment from its banks to the Gulf of Mexico every year.
It's about six-and-a-half times as long as The Volga.
In other words, 2,800,000,000 barleycorns is 6.720 times the length of The Volga, and the length of The Volga is 0.1490 times that amount.
(a.k.a. Волга, a.k.a. İdel (Идел), a.k.a. Атăл (Atăl), a.k.a. Edil, a.k.a. İdil, a.k.a. Рав (Rav)) (from the Valdai Hills, Tver Oblast, Russia through the Caspian Sea)
The largest river in Europe, the Volga river runs 417,000,000 barleycorns in total length. World War II's Battle of Stalingrad between the Nazi Germany and the Soviet Union, which resulted in nearly two million casualties, was fought in part for control of the river.