Oceans and Seas The following table lists the world's oceans and seas, according to area and average depth, including the Pacific Ocean, Atlantic Ocean, Indian Ocean, Southern Ocean, Mediterranean Sea, Arctic Ocean, Caribbean Sea, Bering Sea, and more. NameAreaAverage depthGreatest known depthPlace of greatest known depth sq. mi.sq. kmft.mft.m Pacific Ocean60,060,700155,557,00013,2154,02836,19811,033Mariana Trench Atlantic Ocean29,637,90076,762,00012,8803,92630,2469,219Puerto Rico Trench Indian Ocean26,469,50068,556,00013,0023,96324,4607,455Sunda Trench Southern Ocean17,848,30020,327,00013,100–16,4004,000–5,00023,7367,235South Sandwich Trench Arctic Ocean5,427,00014,056,0003,9531,20518,4565,62577°45'N; 175°W Mediterranean Sea21,144,8002,965,8004,6881,42915,1974,632Off Cape Matapan, Greece Caribbean Sea1,049,5002,718,2008,6852,64722,7886,946Off Cayman Islands South China Sea895,4002,319,0005,4191,65216,4565,016West of Luzon Bering Sea884,9002,291,9005,0751,54715,6594,773Off Buldir Island Gulf of Mexico615,0001,592,8004,8741,48612,4253,787Sigsbee Deep Okhotsk Sea613,8001,589,7002,74983812,0013,658146°10'E; 46°50'N East China Sea482,3001,249,2006171889,1262,78225°16'N; 125°E Hudson Bay475,8001,232,300420128600183Near entrance Japan Sea389,1001,007,8004,4291,35012,2763,742Central Basin Andaman Sea308,000797,7002,85487012,3923,777Off Car Nicobar Island North Sea222,100575,200308942,165660Skagerrak Red Sea169,100438,0001,6114917,2542,211Off Port Sudan Baltic Sea163,000422,200180551,380421Off Gotland NOTE: For Caspian Sea,see Large Lakes of the World. 1. A decision by the International Hydrographic Organization in spring 2000 delimited a fifth world ocean. 2. Includes Black Sea and Sea of Azov.