- a gorge of the Colorado River in N Arizona, extending from its junction with the Little
Colorado River to Lake Mead; cut by vertical river erosion through the multicoloured
strata of a high plateau; partly contained in the Grand Canyon National Park, covering 2610 sq km (1008 sq miles). Length: 451 km (280 miles). Width: 6 km (4 miles)
to 29 km (18 miles). Greatest depth: over 1.5 km (1 mile)
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