The deepest seas on Earth are located within the ocean trenches, which are long, narrow depressions in the ocean floor. Here are some of the deepest seas:The Mariana Trench: Located in the western Pacific Ocean, the Mariana Trench is the deepest known part of any ocean. It reaches a depth of approximately 10,994 meters (36,070 feet) at the Challenger Deep, the lowest point on Earth. The trench is named after the nearby Mariana Islands.The Tonga Trench: Situated in the South Pacific Ocean, the...