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How long is 6,400 kilometers?

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It's about one-and-four-fifths times as long as The Oregon Trail.
In other words, 6,400 kilometers is 1.830 times the length of The Oregon Trail, and the length of The Oregon Trail is 0.5460 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 half as long as The Diameter of Earth.
In other words, 6,400 kilometers is 0.501713930 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 1.99316770 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 12,756.2730 kilometers at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1946 by the United States Army, which reached an altitude of 104.607360 kilometers.
It's about two-and-a-half times as long as The Danube.
In other words, 6,400 kilometers is 2.250 times the length of The Danube, and the length of The Danube is 0.4440 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 three times as long as The Colorado River.
In other words, 6,400 kilometers is 2.750 times the length of The Colorado River, and the length of The Colorado River is 0.3640 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 km in length. Along this length, the river descends from its source, approximately 2.750 kilometers above sea level in the Rocky Mountains, to its mouth in the Gulf of California.
It's about five times as long as The Rhine.
In other words, 6,400 kilometers is 4.850 times the length of The Rhine, and the length of The Rhine is 0.2060 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 km 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 one-fifth as long as The Circumfrence of Earth.
In other words, 6,400 kilometers is 0.159700510 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 6.26172080 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 kilometers. 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 fourteen-and-a-half times as long as The Grand Canyon.
In other words, the length of The Grand Canyon is 0.0699 times 6,400 kilometers.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446 km 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 1.10 kilometers above the floor of Granite Gorge.