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How long is 123 kilometers?

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It's about one-thirtieth as long as The Oregon Trail.
In other words, 123 kilometers is 0.0352 times the length of The Oregon Trail, and the length of The Oregon Trail is 28.40 times that amount.
(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 3,490 km 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-thirtieth as long as The Volga.
In other words, 123 kilometers is 0.0348 times the length of The Volga, and the length of The Volga is 28.70 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 3,530 km 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 thirty times as long as The Indianapolis Motor Speedway.
In other words, 123 kilometers is 30.57150 times the length of The Indianapolis Motor Speedway, and the length of The Indianapolis Motor Speedway is 0.0327102 times that amount.
(Speedway, Indiana) (rectangular oval course)
The rectangular oval course of the Indianapolis Motor Speedway is 4.02336 km. While famous for its automotive racing, the first motorsport held at the track was a series of motorcycle races in August, 1909 — a little less than two years before the inaugural Indianapolis 500 race was run.
It's about thirty times as long as Daytona International Speedway.
In other words, 123 kilometers is 30.57150 times the length of Daytona International Speedway, and the length of Daytona International Speedway is 0.0327102 times that amount.
(Daytona Beach, Florida) (tri-oval course)
The tri-oval course of the Daytona International Speedway, upon which the NASCAR Daytona 500 is run, is 4.02336 km in length. Although the tri-oval design is said to allow for greater visibility during the race, the real reason for the then-unique design was that plot available for construction of the track was only 350 acres and could not accommodate a traditional oval layout of appropriate length.
It's about one-thirtieth as long as The Mississippi River.
In other words, 123 kilometers is 0.03266 times the length of The Mississippi River, and the length of The Mississippi River is 30.620 times that amount.
(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 3,766 km. 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 thirty times as long as The Hollywood Walk of Fame.
In other words, the length of The Hollywood Walk of Fame is 0.031 times 123 kilometers.
(Hollywood Boulevard and Vine Street, Hollywood, California) (approximate length)
The Hollywood Walk of Fame is approximately 3.9 km. Gene Autry, most famous as the singer of "Back in the Saddle Again" and as the writer and singer of "Here Comes Santa Claus," is the only entertainer to have a star in every category — film, television, recording, radio, and theater. One of Autry's stars is also one of only two stars which have been stolen from the Walk and never recovered.
It's about one-thirty-fifth as long as The Distance from L.A. to New York.
In other words, the length of The Distance from L.A. to New York is 36.50 times 123 kilometers.
(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 4,490 km 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.