Rank Ocean Notes
1 Pacific Ocean Separates Asia and Oceania from the Americas
2 Atlantic Ocean Separates the Americas from Eurasia and Africa
3 Indian Ocean Washes upon southern Asia and separates Africa and Australia
4 Southern Ocean Sometimes considered an extension of the Pacific, Atlantic and Indian Oceans, which encircles Antarctica
5 Arctic Ocean Sometimes considered a sea of the Atlantic, which covers much of the Arctic and washes upon northern North America and Eurasia
From
http://en.wikipedia.org/wiki/Ocean