They used longitude lines extending north from 60 degrees south latitude to the southernmost points of South America, Africa, and Australia as the dividing lines between: the South Pacific and South Atlantic; the South Atlantic and the Indian Ocean; and the Indian Ocean and the South Pacific.
ADVERTISEMENTThe northern boundary of the Southern Ocean is shown at 60 degrees south latitude.
The boundaries between the Atlantic and Pacific Oceans, and the Atlantic and Indian Oceans, and the Indian and Pacific Oceans are each shown as a longitude line between the southernmost point of a continent (South America, Africa, and Australia, respectively) and the northern boundary of the Southern Ocean. The Indian-Pacific boundary also has lines passing through the Indonesian archipelago.
The Arctic Ocean's southern boundaries on this map differ from the map above prepared by NOAA. Its boundaries are defined by a line from Norway to Svalbard, Svalbard to Iceland, and Iceland to Greenland; another from Greenland to Baffin Island (Nunavut, Canada) and Baffin Island to Quebec (Canada); and a final line between Alaska and Russia.
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