Aerial view of the Grand Canyon with the Colorado River north of Grand Canyon Village, Arizona, USAGrand Canyon National Park in the US state of Arizona was declared a national park in 1919 and is one
From the air, the canyon's scale becomes almost incomprehensible — 277 miles long, up to 18 miles wide, a mile deep, all carved by the river threading through below. © Dietmar Rabich, CC BY-SA 4.0, via Wikimedia Commons

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