Cotahuasi Canyon is in Peru and has a depth of approximately 3354 meters (over twice the depth of the Grand Canyon).
The deepest ocean trench is Challenger Deep in the Mariana Trench. Mount Everest could lie in this trench and still have a mile of water on top of it. The trench goes 10,924 meters below sea level.
The Cotahuasi Canyon is the deepest ocean canyon, however.
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