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677 miles is about two-and-a-half times as long as The Grand Canyon.
In other words, it's 2.440 times the length of The Grand Canyon, and the length of The Grand Canyon is 0.410 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 277 miles 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 0.6840 miles above the floor of Granite Gorge.
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