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.

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Etymology

Origin of Mariana Trench

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

Example Sentences

See Examples For:

Mariana Trench

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

To put this in perspective, one gigapascal is roughly ten thousand times the pressure of Earth's atmosphere at sea level, or about ten times the pressure at the bottom of the Mariana Trench.

From Science Daily ● Nov. 20, 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

These so-called microplastics are spread throughout the water column and have been found in every corner of the globe, from Mount Everest, the highest peak, to the Mariana Trench, the deepest trough.

From National Geographic ● Feb. 21, 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