DIAM 65-18: Geopolitical Data Elements and Related Features, Data Standard No. 4, Defense Intelligence Agency Manual 65-18, December 1994, published by the Defense Intelligence Agency
The US Government has not yet adopted a standard for hydrographic codes similar to the Federal Information Processing Standards (FIPS) 10-4 country codes. The names and limits of the following oceans and seas are not always directly comparable because of differences in the customers, needs, and requirements of the individual organizations. Even the number of principal water bodies varies from organization to organization. Factbook users, for example, find the Atlantic Ocean and Pacific Ocean entries useful, but none of the following standards include those oceans in their entirety. Nor is there any provision for combining codes or overcodes to aggregate water bodies. The recently delimited Southern Ocean is not included.
Principal Oceans and Seas of the World
With Hydrographic Codes by Institution
IHO 23-4th IHO 23-3rd* ACIC M 49-1 DIAM 65-18
Arctic Ocean 9 17 A 5A
Atlantic Ocean - - - -
Baltic Sea 2 1 B26 7B
Eastern Mediterranean 3.1.2 28 B - 8E
Indian Ocean 5 45 F 6A
Mediterranean Sea 3.1 28 B11 -
North Atlantic Ocean 1 23 B 1A
North Pacific Ocean 7 57 D 3A
Pacific Ocean - - - -
South Atlantic Ocean 4 32 C 2A
South China and Eastern 6 49, 48 D18 plus 3U plus
Archipelagic Seas others others
South Pacific Ocean 8 61 E 4A
Western Mediterranean 3.1.1 28 A - 8W
*The letters after the numbers are subdivisions, not footnotes.
This page was last updated on 20 October, 2005
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Appendix F - Cross-Reference List of Geographic Names
Name Entry in The World Latitude Longitude
Factbook (deg min) (deg min)