an ocean (one of the large bodies of water separating the continents); the ocean (the continuous body of salt water covering a majority of the Earth's surface); ocean (immense expanse; any vast space or quantity without apparent limit)
Arctic Ocean (the smallest of the five oceans of the Earth, on and around the North Pole, bordered by the three continents of Asia, Europe and North America)
Southern Ocean (the portion of the World Ocean surrounding Antarctica, variously taken as the waters south of the Antarctic Circle, the waters south of 60° S, or the waters bounded by the Antarctic Convergence)