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668 kilometers is about one-and-a-half times as long as The Grand Canyon.
In other words, the length of The Grand Canyon is 0.6670 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446 km 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 1.10 kilometers above the floor of Granite Gorge.
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