What is the world's deepest canyon?

Travel Info
I believe it is located in China

Travel Tips

Hell's Canyon on the border of Idaho and Oregon with the Snake River going through it.
It's over 8,000 feet deep.

However, the Marianas Trench in the Pacific Ocean is the deepest canyon...over 30,000 feet deep. Of course, it's underwater. Source(s): Hammond World Atlas

Other Travel Tips
The Yarlung Tsangpo Canyon (also called Tsangpo Gorge) in Tibet is the deepest according to Wikipedia (http://en.wikipedia.org/wiki/yarlung_tsa...

Colca Canyon
Colca Canyon in southern Peru is the deepest canyon in the world.
http://googleglobetrotting.com/info.php/... http://www.bootsnall.com/articles/02-08/...