It's about 700 times as tall as a Giraffe
It's about one-seven-hundredth as long as The Danube
In other words, 4 kilometers is 0.0014 times the length of The Danube, and the length of The Danube is 714 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 km 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-eight-hundred-fiftieth as long as The Oregon Trail
In other words, 4 kilometers is 0.00115 times the length of The Oregon Trail, and the length of The Oregon Trail is 870 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-nine-hundredth as long as The Volga
In other words, 4 kilometers is 0.00113 times the length of The Volga, and the length of The Volga is 885 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 one-nine-hundred-fiftieth as long as The Mississippi River
In other words, 4 kilometers is 0.001062 times the length of The Mississippi River, and the length of The Mississippi River is 941.60 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 1,000 times as long as a Beetle (Volkswagen)
In other words, 4 kilometers is 980.60 times the length of a Beetle (Volkswagen), and the length of a Beetle (Volkswagen) is 0.00102 times that amount.(1964 model) (a.k.a. Volkswagen 1200, a.k.a. Käfer)
A 1964 Volkswagen Beetle measures 0.004079 kilometers. 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-one-thousandth as long as The Distance from L.A. to New York
In other words, 4 kilometers is 0.000891 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 1,120 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 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.