Arches National Park, 76,519 acres (30,979 hectares), E Utah; est. as a national monument 1929, designated a national park 1971. Located in red-rock country and overlooking the gorge of the Colorado River, this area contains a vast and unusual array of natural rock formations. Water, frost, and wind have carved giant but graceful arches, windows, spires, and pinnacles. See National Parks and Monuments (table).
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.