It's about two-and-a-half times as long as The Volga
In other words, 8,290,000,000 milimeters is 2.350 times the length of The Volga, and the length of The Volga is 0.4260 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 3,530,000,000 milimeters 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 two-and-a-half times as long as The Oregon Trail
In other words, 8,290,000,000 milimeters is 2.380 times the length of The Oregon Trail, and the length of The Oregon Trail is 0.420 times that amount.(from Independence, Missouri to Oregon City, Oregon)
The historic Oregon Trail stretched 3,490,000,000 milimeters 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 three times as long as The Danube
In other words, 8,290,000,000 milimeters is 2.910 times the length of The Danube, and the length of The Danube is 0.3440 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 2,850,000,000 milimeters 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 three-and-a-half times as long as The Colorado River
In other words, 8,290,000,000 milimeters is 3.560 times the length of The Colorado River, and the length of The Colorado River is 0.2810 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 2,330,000,000 milimeters in length. Along this length, the river descends from its source, approximately 2,750,000 milimeters above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about one-fifth as long as The Circumfrence of Earth
In other words, 8,290,000,000 milimeters is 0.206862060 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 4.83413920 times that amount.(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 40,075,014,000 milimeters. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
It's about six-and-a-half times as long as The Rhine
In other words, 8,290,000,000 milimeters is 6.280 times the length of The Rhine, and the length of The Rhine is 0.1590 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 1,320,000,000 milimeters 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 eighteen-and-a-half times as long as The Grand Canyon
In other words, the length of The Grand Canyon is 0.0538 times 8,290,000,000 milimeters.(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446,000,000 milimeters along the course of the Colorado River at its bottom. Having opened in early 2007, the Grand Canyon Skywalk allows tourists to stand on a horseshoe-shaped glass walkway 1,100,000 milimeters above the floor of Granite Gorge.