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630,000 shaftments is about one-fifth as long as The Grand Canyon.
In other words, it's 0.2150 times the length of The Grand Canyon, and the length of The Grand Canyon is 4.650 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 2,930,000 shaftments 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 7,220 shaftments above the floor of Granite Gorge.
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