It's about one-seven-hundred-fiftieth as long as The Danube
In other words, 3,900 meters is 0.00137 times the length of The Danube, and the length of The Danube is 730 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 2,850,000 meters 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-nine-hundredth as long as The Oregon Trail
In other words, 3,900 meters is 0.00112 times the length of The Oregon Trail, and the length of The Oregon Trail is 893 times that amount.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 3,490,000 meters 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-nine-hundredth as long as The Volga
In other words, 3,900 meters is 0.0011 times the length of The Volga, and the length of The Volga is 909 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 3,530,000 meters 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 950 times as long as a Beetle (Volkswagen)
In other words, 3,900 meters is 956.10 times the length of a Beetle (Volkswagen), and the length of a Beetle (Volkswagen) is 0.001046 times that amount.(1964 model) (a.k.a. Volkswagen 1200, a.k.a. Käfer)
A 1964 Volkswagen Beetle measures 4.079 m. As the longest continuously-produced automobile design — in production for 75 years between 1938 and 2003 — the Beetle was voted the most fourth-most influential car of the twentieth century by the Global Automotive Elections Foundation.
It's about one-nine-hundred-fiftieth as long as The Mississippi River
In other words, 3,900 meters is 0.001036 times the length of The Mississippi River, and the length of The Mississippi River is 965.30 times that amount.(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
The total length of the Mississippi River is 3,766,000 meters. 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 one-one-thousandth as long as The Distance from L.A. to New York
In other words, 3,900 meters is 0.000869 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 1,150 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 4,490,000 meters 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 one-one-thousandth as long as I-80
In other words, 3,900 meters is 0.000840874 times the length of I-80, and the length of I-80 is 1,189.240 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 4,638,030 meters. A 60,000 meters 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.