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  1. Oxford American Dictionary

    Grand Canyon

    • IPA[ˌɡran(d) ˈkanyən]
    • ph.
      a deep gorge in Arizona, formed by the Colorado River. It is about 277 miles (440 km) long, 5–15 miles (8–24 km) wide, and, in places, 6,000 feet (1,800 m) deep. The area was designated a national park in 1919.