Horizon Deep

[ huh-rahy-zuhn deep ]

noun

the second-deepest known portion of seafloor in the world, located in the South Pacific Ocean’s Tonga Trench at a depth of 35,509 feet (10,823 meters).: Compare Challenger Deep, Emden Deep.

Origin of Horizon Deep

First recorded in 1950–55; named after the research vessel Horizon of the Scripps Institution of Oceanography, which discovered the deep in 1952

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