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  1. Mariana Trench

    • ph.
      an ocean trench to the south-east of the Mariana Islands in the western Pacific, with the greatest known ocean depth (11,034 m, 36,201 ft at the Challenger Deep).
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    • IPA[ˌmerēˈänə trenCH]
    • ph.
      an ocean trench to the southeast of the Mariana Islands in the western Pacific Ocean. Its ...

    Oxford American Dictionary