It's about as long as The Oregon Trail.
In other words, the length of The Oregon Trail is 1.01 times 624.2 leagues.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 628 leagues 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 as long as The Volga.
In other words, the length of The Volga is 1.02 times 624.2 leagues.(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 635 leagues 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 nine-tenths as long as The Mississippi River.
In other words, 624.2 leagues is 0.9209 times the length of The Mississippi River, and the length of The Mississippi River is 1.086 times that amount.(from Lake Itasca, Minnesota through Pilottown, Plaquemines Parish, Louisiana)
It's about one-and-one-fifth times as long as The Danube.
In other words, 624.2 leagues is 1.22 times the length of The Danube, and the length of The Danube is 0.82 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)
It's about three-fourths as long as The Distance from L.A. to New York.
In other words, 624.2 leagues is 0.772 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 1.3 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)
It's about three-fourths as long as I-80.
In other words, 624.2 leagues is 0.747743 times the length of I-80, and the length of I-80 is 1.33736 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 834.779 leagues. A 10.7991 leagues 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 one-and-a-half times as long as The Colorado River.
In other words, 624.2 leagues is 1.49 times the length of The Colorado River, and the length of The Colorado River is 0.671 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)