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How long is 623 leagues?

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It's about three-fifths as long as The Great Wall of China (wall only)
In other words, 623 leagues is 0.553 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 1.808 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 1,127 leagues. 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 half as long as The Amazon River
In other words, 623 leagues is 0.5377 times the length of The Amazon River, and the length of The Amazon River is 1.86 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 1,159 leagues. 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 two-fifths as long as The Great Wall of China (total)
In other words, 623 leagues is 0.391 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 2.56 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) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 1,590 leagues. 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 two-and-a-half times as long as The Rhine
In other words, 623 leagues is 2.62 times the length of The Rhine, and the length of The Rhine is 0.382 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 238 leagues 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-fourth as long as The Diameter of Earth
In other words, 623 leagues is 0.2713479 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 3.6853058 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 2,295.94550 leagues 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 18.8278190 leagues.
It's about eight times as long as The Grand Canyon
In other words, 623 leagues is 7.76 times the length of The Grand Canyon, and the length of The Grand Canyon is 0.129 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 80.30 leagues 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 0.1980 leagues above the floor of Granite Gorge.
It's about one-tenth as long as The Circumfrence of Earth
In other words, 623 leagues is 0.08637272 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 11.57773 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 7,212.92550 leagues. 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.