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Mariana Trench Syllabification: Ma·ri·an·a Trench

Definition of Mariana Trench in English:

An ocean trench to the southeast of the Mariana Islands in the western Pacific Ocean. Its greatest known ocean depth is 36,201 feet (11,034 m) at the Challenger Deep, which was discovered by HMS Challenger II in 1948.

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Pronunciation: ˈduːfʌs
a stupid person