The deepest ocean in the world is the Pacific Ocean with an average depth of 13,740 feet. The Missouri Botanical Garden reports that the deepest point in the Pacific Ocean is the Mariana Trench at 36,200 feet.
The second-deepest ocean is the Atlantic Ocean with an average depth of 12,254 feet. The deepest point of this ocean is the Puerto Rico Trench at 28,374 feet. The third-deepest ocean is the Indian Ocean with an average depth of 12,740. Its deepest point is the Java Trench at 25,344 feet. The Arctic Ocean is the fourth-deepest ocean. Its average depth is 3,407 feet and deepest point is the Eurasia Basin at 17,881 feet.