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How long is 668 kilometers?

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It's about one-six-hundredth as long as The Distance from Earth to the Moon.
In other words, 668 kilometers is 0.001737608 times the length of The Distance from Earth to the Moon, and the length of The Distance from Earth to the Moon is 575.50380 times that amount.
(a.k.a. Luna) (median of semi-major axis, or apigee, and semi-minor axes, or perigee)
The orbit of the Moon around the Earth is elliptical, with an average distance of 384,436.5 km from center-to-center. About 428.376 kg of moon rock have been cataloged on the Earth, from the American Apollo and Soviet Luna Programs, and from samples that have been extracted from meteorites.
It's about one-sixtieth as long as The Circumfrence of Earth.
In other words, 668 kilometers is 0.01666874 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 59.9925370 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 one-twentieth as long as The Diameter of Earth.
In other words, 668 kilometers is 0.052366392 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 19.096217 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 1942 by the United States Army, which reached an altitude of 104.607360 kilometers.
It's about one-fifteenth as long as The Great Wall of China (total).
In other words, the length of The Great Wall of China (total) is 13.20 times 668 kilometers.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 8,850 km. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-tenth as long as The Amazon River.
In other words, 668 kilometers is 0.10380 times the length of The Amazon River, and the length of The Amazon River is 9.6340 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 6,437 km. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about one-tenth as long as The Great Wall of China (wall only).
In other words, 668 kilometers is 0.10670 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 9.3720 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 6.2590 kilometers. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about one-tenth as long as I-80.
In other words, 668 kilometers is 0.1440270 times the length of I-80, and the length of I-80 is 6.943140 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 4,638.03 km. A 60 km 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.