The deepest depressions in the seas and oceans are known as oceanic trenches. These are long, narrow, and extremely deep areas that form where tectonic plates converge. Here are some of the deepest oceanic trenches:Mariana Trench: Located in the western Pacific Ocean, the Mariana Trench is the deepest known trench on Earth. Its maximum recorded depth is approximately 10,984 meters (36,070 feet) in the Challenger Deep, making it the deepest point in any ocean.Tonga Trench: Situated in the sout...