A canyon is a narrow, deep valley cut by a river through rock. Canyons range in size from narrow slits to huge trenches. They have very steep sides and may be thousands of feet deep. Smaller valleys of similar appearance are called gorges.
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Largest canyonsThe Yarlung Tsangpo Grand Canyon (or Tsangpo Canyon), along the Yarlung Tsangpo River in Tibet, is regarded by some as the deepest canyon in the world at 5,500 metres (18,000 ft). It is slightly longer than the Grand Canyon in the United States.
1. Grand Canyon. The Grand Canyon is located in northern Arizona and is one of the great tourist attractions in the United States. Carved over several million years by the Colorado River, the canyon attains a depth of over 1.6 km (1 mile) and 446 km (277 miles) long.
The Fish River Canyon of southern Namibia is the second largest canyon in the World after the Grand Canyon of the USA. It consists of a northern upper and a southern lower canyon.
This is the largest (and most beautiful) canyon in EuropeIn the heart of the picturesque Provence region lies a wonder of nature, known the world over as the Verdon Gorge.