How many miles is the deepest ocean?
According to my World Almanac, the Pacific Ocean has the greatest
average depth -- 12,925 feet, or almost 2 1/2 miles. The Pacific also
has the largest known maximum depth, in the famous Mariana Trench; this
maximum depth is 35,840 feet, or a little over 6 3/4 miles. (That's
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Update: June 2012