five named oceans. Arctic Ocean The Arctic Ocean covers much of the Arctic and washes upon Northern America and Eurasia. It is sometimes considered a sea or estuary of the Atlantic Ocean. The International Hydrographic Organization (IHO) defines the limits of the Arctic Ocean (excluding the seas it contains) as follows:Between Greenland and West Spitzbergen — The Northern limit of Greenland Sea. Between West Spitzbergen and North East Land — the parallel of lat. 80° N. From Cape Leigh Smith to Cape Kohlsaat — the Northern limit of Barentsz Sea. From Cape Kohlsaat to Cape Molotov — the Northern limit of Kara Sea. From Cape Molotov to the Northern extremity of Kotelni Island — the Northern limit of Laptev Sea. From the Northern extremity of Kotelni Island to the Northern point of Wrangel Island — the Northern limit of East Siberian Sea. From the Northern point of Wrangel Island to Point Barrow — the Northern limit of Chuckchi Sea. From Point Barrow to Cape Land’s End on Prince Patrick Island — the Northern limit of Beaufort Sea, through the Northwest coast of Prince Patrick Island to Cape Leopold M’Clintock, thence to Cape Murray (Brook Island) and along the Northwest coast to the extreme Northerly point; to Cape Mackay (Borden Island); through the Northwesterly coast of Borden Island to Cape Malloch, to Cape Isachsen (Ellef Ringnes Island); to the Northwest point of Meighen Island to Cape Stallworthy (Axel Heiberg Island) to Cape Colgate the extreme West point of Ellesmere Island; through the North shore of Ellesmere Island to Cape Columbia thence a line to Cape Morris Jesup (Greenland).Note that these definitions exclude any marginal waterbodies that are separately defined by the IHO (such as the Kara Sea and East Siberian Sea), though these are usually considered to be part of the Arctic Ocean. The CIA defines the limits of the Arctic Ocean differently, as depicted in the map comparing its definition to the IHO's definition. Notes Atlantic Ocean The Atlantic Ocean separates the Americas from Europe and Africa. It may be further subdivided by the Equator into northern and southern portions. North Atlantic Ocean The 3rd edition, currently in force, of the International Hydrographic Organization's (IHO) Limits of Oceans and Seas defines the limits of the North Atlantic Ocean (excluding the seas it contains) as follows:On the West. The Eastern limits of the Caribbean Sea, the Southeastern limits of the Gulf