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How long is 855 spans?

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It's about one-seven-thousandth as long as The Rhine
In other words, 855 spans is 0.00015 times the length of The Rhine, and the length of The Rhine is 6,760 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 5,770,000 spans 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 one-ten-thousandth as long as The Colorado River
In other words, 855 spans is 0.0000839 times the length of The Colorado River, and the length of The Colorado River is 11,900 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 10,200,000 spans in length. Along this length, the river descends from its source, approximately 12,000 spans above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about 15,000 times as long as an Aspirin
In other words, 855 spans is 14,000 times the length of an Aspirin, and the length of an Aspirin is 0.000071 times that amount.
(for up & up aspirin, 325mg, regular strength tablets) (a.k.a. acetylsalicylic acid, a.k.a. ASA)
A single aspirin tablet measures 0.061 spans in diameter. One of the most common medicines in the world and a foundation of worldwide health systems, an estimated 40,000 metric tons of aspirin are consumed each year.
It's about one-fifteen-thousandth as long as The Danube
In other words, 855 spans is 0.0000686 times the length of The Danube, and the length of The Danube is 14,600 times that amount.
(a.k.a. Donau, a.k.a. Dunaj, a.k.a. Dunav, a.k.a. Duna, a.k.a. Дунав (Dunav), a.k.a. Dunărea, a.k.a. Дунáй (Dunay), a.k.a. Tuna) (from Breg Martinskapelle, Black Forest, Germany through the Danube Delta, Romania)
The Danube river runs 12,500,000 spans in total length. Intersecting Vienna, Austria; Bratislava, Slovakia; Budapest, Hungary; and Belgrade, Serbia, the Danube touches more capital cities than any other river.
It's about one-twenty-thousandth as long as The Oregon Trail
In other words, 855 spans is 0.000056 times the length of The Oregon Trail, and the length of The Oregon Trail is 17,900 times that amount.
(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 15,300,000 spans across five (sometimes six) states in the western United States. In the early years of the Trail's existence, the trip was estimated to have taken an average of 160 days.
It's about one-twenty-thousandth as long as The Volga
In other words, 855 spans is 0.0000554 times the length of The Volga, and the length of The Volga is 18,100 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 15,400,000 spans 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.
It's about one-twenty-thousandth as long as The Mississippi River
In other words, 855 spans is 0.0000519 times the length of The Mississippi River, and the length of The Mississippi River is 19,270 times that amount.
(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 16,470,000 spans. 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.