If you were asked the question to name a famous canyon, your answer is likely to be The Grand Canyon. If you were asked to name another one, you probably wouldn't be able to. So, seeing as it's obvious that nobody is really bothered about knowing about other canyons, here are ten facts about most famous of them all: The Grand Canyon.

Fact One

The Grand Canyon is a massive gorge carved out by the Colorado River over millions of years. It is located in Arizona, USA.

Fact Two

The Grand Canyon is 446 kilometres (227 miles) long. In some parts it reaches a depth of 1.83 kilometres (1 mile) and a width of 29 kilometres (18 miles).

Fact Three

Over five million people a year visit the Grand Canyon, most of which are from the United States.

Fact Four

The Grand Canyon is home to several native American tribes. The first European to discover the canyon was the Spaniard Garcia López de Cárdenas in 1540.

Fact Five

A list compiled by CNN in 1997 puts the Grand Canyon as one of the Seven Natural Wonders of the World. Also on the list is the Great Barrier Reef, Rio de Janeiro's harbour, Mount Everest, the Northern and Southern Lights (Aurora Borealis & Aurora Australis), Parícutin Volcano in Mexico and Victoria Falls. 

Fact Six

The Kolb Brothers built a photographic studio on the South Rim. They would take photographs of customers descending the canyon and have them developed by the time they returned. They also made a film of a river trip through the canyon in 1911 which was shown at their studio twice a day every day from 1915 to 1975 at their studio and narrated by Emery Kolb.

Fact Seven

The Grand Canyon became a National Monument on 11th January 1908 and a World Heritage site on 24th October 1979. Billions of years of Earth's geological history is preserved in the walls of the canyon.

Fact Eight

A glass walkway extends over the rim of the Grand Canyon, suspended 1200 metres above the canyon floor. Known as the Grand Canyon Skywalk, it cost over $30 million to build and opened in 2007. It is owned by the Hualapai Indian tribe.

Fact Nine

The temperature in the Grand Canyon can vary greatly depending on the time of year and your location. At its coldest in winter, the North Rim can reach -23 degrees Celsius (-10 degrees Fahrenheit). At its hottest in summer, the inner Canyon range can reach 43 degrees Celsius (110 degrees Fahrenheit).  

Fact Ten

The Grand Canyon isn't the deepest gorge in the world. The gorge that holds this honour is the Kali Gandaki Gorge in Nepal.