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Is 1,200 milimeters as long as The Grand Canyon?

It's about one-three-hundred-fifty-thousandth as long as The Grand Canyon
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The length of The Grand Canyon is about 446,000,000 milimeters.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446,000,000 milimeters 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 1,100,000 milimeters above the floor of Granite Gorge.
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