Editing Canyon (section)

==Largest==
The definition of "largest canyon" is imprecise, because a canyon can be large by its depth, its length, or the total area of the canyon system. Also, the inaccessibility of the major canyons in the [[Himalaya]] contributes to their not being regarded as candidates for the biggest canyon. The definition of "deepest canyon" is similarly imprecise, especially if one includes mountain canyons, as well as canyons cut through relatively flat [[plateau]]s (which have a somewhat well-defined rim elevation).

The [[Yarlung Tsangpo Grand Canyon]] (or Tsangpo Canyon), along the [[Yarlung Tsangpo|Yarlung Tsangpo River]] in [[Tibet Autonomous Region|Tibet, China]], is regarded by some as the deepest canyon on Earth at {{Convert|5500|m}}. It is slightly longer than [[Grand Canyon]] in the United States.<ref>{{cite web|url=http://www.kepu.net.cn/english/canyon/hiking/hik301.html|title=China Virtual Museums: Canyon|website=Kepu.net}}</ref> Others consider the [[Kali Gandaki Gorge]] in midwest Nepal to be the deepest canyon, with a {{Convert|6400|m|adj=on}} difference between the level of the river and the peaks surrounding it.{{citation needed|date=August 2024}}

Vying for the deepest canyon in the Americas is the [[Cotahuasi Canyon]] and [[Colca Canyon]], in southern Peru. Both have been measured at over {{Convert|3500|m}} deep.

[[Grand Canyon]] of northern [[Arizona]] in the United States, with an average depth of {{Convert|1600|m}} and a volume of {{Convert|4.17|e12m3|abbr=off}},<ref>{{cite web|url=http://www.nps.gov/grca/parkmgmt/statistics.htm|title=Park Statistics|website=National Park Service|location=USA}}</ref> is one of the world's largest canyons. It was among the 28 finalists of the [[New7Wonders of Nature|New 7 Wonders of Nature]] worldwide poll. (Some referred to it as one of the [[Wonders of the World#Seven Natural Wonders of the World|seven natural wonders of the world]].)<ref>{{cite web|last=Truong|first=Alice|title=Everything About the Grand Canyon|url=http://dsc.discovery.com/adventure/everything-about-the-grand-canyon.html|publisher=Discovery Communications|access-date=5 February 2012|date=1 July 2011}}</ref>

The largest canyon in Europe is [[Tara River Canyon]].

The largest canyon in Africa is the [[Fish River Canyon]] in [[Namibia]].<ref name="birdfinder">{{cite book|author=Cohen, Callan|author2=Spottiswoode, Claire|author3=Rossouw, Jonathan|name-list-style=amp |date=2006|title=Southern African Birdfinder|isbn= 978-1-86872-725-4|page= 210|publisher=Penguin Random House South Africa }}</ref>

In August 2013, the discovery of [[Greenland]]'s [[Grand Canyon (Greenland)|Grand Canyon]] was reported, based on the analysis of data from [[Operation IceBridge]]. It is located under an ice sheet. At {{Convert|750|km}} long, it is believed to be the longest canyon in the world.<ref>{{cite web|url=http://news.discovery.com/earth/rocks-fossils/greenland-longest-canyon-discovered-130830.htm|title=Grand Canyon of Greenland Discovered under Ice|website=news.discovery.com|date=2017-05-10|access-date=2013-08-30|archive-date=2016-05-11|archive-url=https://web.archive.org/web/20160511221221/http://news.discovery.com/earth/rocks-fossils/greenland-longest-canyon-discovered-130830.htm|url-status=dead}}</ref>

Despite not being quite as deep or long as Grand Canyon, the [[Capertee Valley]] in Australia is actually 1&nbsp;km wider than Grand Canyon, making it the widest canyon in the world.<ref name="MyUser_Dailytelegraph.com_March_28_2016c">{{cite news|url=http://www.dailytelegraph.com.au/lifestyle/parenting/school-holidays/forget-the-grand-canyon-the-second-biggest-geological-marvel-in-the-world-is-right-here-in-nsw/news-story/3b0b48ac4d7a5cd323dd4b6590266fd8 |title=Capertee Valley: Australia's own Grand Canyon |newspaper=The Daily Telegraph |date=14 December 2015 |author=Fitzsimons, David |access-date= March 28, 2016}}</ref><ref name="MyUser_Abc.net_March_28_2016c">{{cite web |url=http://www.abc.net.au/science/articles/2012/05/22/3507609.htm |title=Grand Canyon is not so grand › Dr Karl's Great Moments in Science |website=ABC Science|date=22 May 2012 |author=Kruszelnicki, Karl S. |access-date= March 28, 2016}}</ref>
{{wide image|Capertee Valley panorama.jpg|900|Panoramic view of the [[Capertee Valley]] in Australia, the widest largest canyon in the world}}