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3,900 shackles is about one-fourth as long as The Grand Canyon.
In other words, it's 0.240 times the length of The Grand Canyon, and the length of The Grand Canyon is 4.170 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 16,300 shackles 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 40.10 shackles above the floor of Granite Gorge.
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