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813 furlongs is about two-fifths as as The Grand Canyon.
In other words, it's 0.367 times the of The Grand Canyon, and the of The Grand Canyon is 2.72 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 5.47 furlongs above the floor of Granite Gorge.
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