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How Deep Is the Ocean ? The Pacific Ocean is the world 's largest and deepest ocean . Any ocean depth greater than 200 meters is considered deep sea. The average depth of the World Ocean is 3.5 km. However, the deepest known part of the World Ocean is Challenger Deep , which has a depth of about 11 km. Challenger Deep is located in the southern end of the Mariana Trench, in the Pacific Ocean , 700 kilometers southwest of Guam. In addition to Challenger Deep , there are four other deep points in ... Oceans and their marginal seas are the world ’s largest, deepest waterbodies. The world ’s deepest point, the Challenger Deep , is located in the Pacific Ocean . With a depth of 36,201 feet, the Challenger Deep of the Mariana Trench is the deepest known oceanic trench in the world and is located in the Pacific Ocean . What is the Deepest Ocean in the World? The Mariana Trench is renowned as the deepest ocean in the world, a natural wonder that never ceases to amaze. It’s located in the western Pacific Ocean, east of the Mariana Islands, and it stretches over 1,550 miles (2,500 kilometers) long.