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1. Mariana Trench. Better known as the deepest point on earthâs surface, this trench lies in Pacific Ocean, at Challenger Deep. Located at a depth of about 10.91 km or 11,033 meter below sea level, this trench runs for 2,550 kilometer, somewhere below the expanse of water lying between Australia and Japan. Credits: Kmusser/wikipedia.org.
As the plates continue to press against one another, the ocean plate gradually sinks beneath the continental crust and re-enters the mantle. According to Live Science, the deepest known ocean trench is the Mariana Trench, located in the Pacific Ocean. It is approximately 1,500 miles long. The deepest portion of the Mariana Trench is the Challenger Deep, a narrow portion at the southern end, which is roughly 36,000 feet deep. The water temperature in this area is slightly above freezing.The world's ocean trenches remain largely unexplored due to the immense pressures at such depths.