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Mariana Trench

American  
[mair-ee-ah-nuh trench, mar-] / ˈmɛər iˌɑ nə ˈtrɛntʃ, ˈmær- /

noun

  1. the world’s deepest oceanic trench, a crescent-shaped depression located in the western Pacific Ocean, south and west of the Mariana Islands: site of the Challenger Deep.


Etymology

Origin of Mariana Trench

First recorded in 1930–35; named after the Mariana Islands

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

By comparison, pressure at the bottom of the Mariana Trench, the deepest location on Earth, reaches only about 1 kilobar.

From Science Daily Jun. 23, 2026

Some years later, you may recall, he made a solo dive in a submersible to the bottom of the Mariana Trench.

From Slate Dec. 9, 2025

Temperatures can reach more than 400 degrees Fahrenheit; the pressure can be as high as at the bottom of the Mariana Trench in the Pacific Ocean, the deepest point in the world’s oceans.

From The Wall Street Journal Oct. 29, 2025

In 2021, the duo ventured together in a submersible to the Challenger Deep and the Sirena Deep in the Mariana Trench.

From BBC May 28, 2024

A hug from Mom hadn’t fixed it, but it had pulled Cat’s heart from the bottom of the Mariana Trench to somewhere around sea level.

From "Caterpillar Summer" by Gillian McDunn

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