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813 furlongs is about two-fifths as long as The Grand Canyon.
In other words, it's 0.3670 times the length of The Grand Canyon, and the length of The Grand Canyon is 2.720 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 2,220 furlongs 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 5.470 furlongs above the floor of Granite Gorge.
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