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The average depth of the ocean is about 4,267 meters (14,000 feet). The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Challenger Deep is approximately 11,030 meters (36,200 feet) deep. It is named after the HMSChallenger, whose crew first sounded the depths of the trench in 1875.

For more information:
Soundings, Sea-Bottom, and Geophysics, NOAA's Ocean Explorer