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The Pacific Ocean is the deepest ocean in the world, plunging to depths of around 11,000 metres in the Mariana Trench. Covering more than 63 million square miles, it is also the largest and most... The Mariana Trench is an oceanic trench located in the western Pacific Ocean , about 200 kilometres (124 mi) east of the Mariana Islands; it is the deepest oceanic trench on Earth . Discover the deepest oceans and seas on Earth , from the Pacific Ocean’s Mariana Trench to the Caribbean and the Arctic. Learn how deep they reach and why these regions are vital to ocean science. Ocean trenches are steep depressions in the deepest parts of the ocean where old ocean crust from one tectonic plate is pushed beneath another plate, raising mountains, causing earthquakes, and forming volcanoes on the seafloor and on land. So what is the Mariana Trench? And what exactly is living in its depths? In this article, we’ll explore everything you need to know about the Mariana Trench, including some astounding facts about this mysterious habitat and its extreme pressure.