Before revision: Definitions and use center|The International Hydrographic Organization's delineation of the "Southern Ocean" has moved steadily southward since the original 1928 edition of its Limits of Oceans and Seas.
After revision: Definition and term use center|The International Hydrographic Organization's delineation of the "Southern Ocean" has moved steadily southward since the original 1928 edition of its Limits of Oceans and Seas.