Correction for the size of Grand Canyon National Park
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How big is 669 square miles?
It's about one-third as big as Grand Canyon National Park
The size of Grand Canyon National Park is about 1,903.711780 square miles.
(Coconino County and Mohave Counties, Arizona, near Fredonia and Grand Canyon, Arizona)
Containing the 446 km (277 mi) Grand Canyon gorge, Grand Canyon National Park covers 1,903.711440 square miles.