Formed by the same plates that created the Philippine Trench, the Mariana Trench is just northeast of that slightly shallower one, to the east of the Mariana Island chain and just south of Japan. It’s caused when the oceanic crystal plate slides under the another light continental plate or another oceanic plate. In 2017 scientists found plastic fibres in tap water, and plastic has been found in the stomachs of sea creatures in the deepest part of the ocean. There, you’ll find a deep, crescent-shaped trench. The trench is 1,554 miles long and 44 miles wide, or 120 times larger than the Grand Canyon. Where is the deepest place on Earth? Known as the hadal zone, the very bottom of the deepest sea trench is a result of plunging trenches created by shifting tectonic plates. 10 Amazing deepest Trench in the world One of the incredible facts about trench is that it’s formed or originated due to the slides of oceanic plate between one and another, and famously is known as deepest Trench in the world and Deepest Part of the Ocean. Scientifically speaking, the deepest part of the ocean refers to the maximum depth of a point that can be accessed or defined. It’s beneath the surface of the Pacific Ocean to the southeast of Japan. Media caption Victor Vescovo descended almost 11km in a submersible to the deepest part of the Pacific Ocean Witnessing the dive from the Pacific was Don Walsh. This is the deepest point on Earth—Challenger Deep. Every such deepest part of the ocean is referred to as deep trenches. The average depth of the ocean is about 12,100 feet.The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Most plastic waste ends up … This is called the “Mariana Trench.” Near the southern tip of the crescent, there is a small slot-shaped area. It’s caused when the oceanic crystal plate slides under the another light continental plate or another oceanic plate. 10 Amazing deepest Trench in the world One of the incredible facts about trench is that it’s formed or originated due to the slides of oceanic plate between one and another, and famously is known as deepest Trench in the world and Deepest Part of the Ocean. The oceans' deepest area is the Mariana Trench, also called the Marianas Trench, which is in the western part of the Pacific Ocean. The Mariana Trench is the deepest of all ocean trenches.