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| Name | Entry in The World Factbook | |
| Atacama | Chile | |
| Athens [US Embassy] | Greece | |
| Attu | United States | |
| Auckland [US Consulate General] | New Zealand | |
| Auckland Islands | New Zealand | |
| Australes Îles (Îles Tubuai) | French Polynesia | |
| Axel Heiberg Island | Canada | |
| Azores | Portugal | |
| Azov, Sea of | Atlantic Ocean | |
| B | Bab el Mandeb | Indian Ocean |
| Babuyan Channel | Pacific Ocean | |
| Babuyan Islands | Philippines | |
| Baffin Bay | Arctic Ocean | |
| Baffin Island | Canada | |
| Baghdad [US Embassy] | Iraq | |
| Balabac Strait | Pacific Ocean | |
| Balearic Islands | Spain | |
| Balearic Sea (Iberian Sea) | Atlantic Ocean | |
| Bali [US Consular Agency] | Indonesia | |
| Bali Sea | Indian Ocean | |
| Balintang Channel | Pacific Ocean | |
| Balintang Islands | Philippines | |
| Balleny Islands | Antarctica | |
| Baltic Sea | Atlantic Ocean | |
| Baluchistan | Afghanistan; Iran; Pakistan | |
| Bamako [US Embassy] | Mali | |
| Banaba (Ocean Island) | Kiribati | |
| Bandar Seri Begawan [US Embassy] | Brunei | |
| Banda Sea | Pacific Ocean | |
| Bangkok [US Embassy] | Thailand | |
| Bangui [US Embassy] | Central African Republic | |
| Banjul [US Embassy] | Gambia, The | |
| Banks Island | Canada | |
| Banks Islands (Îles Banks) | Vanuatu | |
| Barcelona [US Consulate General] | Spain | |
| Barents Sea | Arctic Ocean | |
| Barranquilla [US Consulate] | Colombia | |
| Bashi Channel | Pacific Ocean | |
| Basilan Strait | Pacific Ocean | |
| Bass Strait | Indian Ocean | |
| Batan Islands | Philippines | |
| Bavaria (Bayern) | Germany, Federal Republic of | |
| Beagle Channel | Atlantic Ocean | |
| Bear Island (Bjørnøya) | Svalbard | |
| Beaufort Sea | Arctic Ocean | |
| Bechuanaland | Botswana | |
| Beijing [US Embassy] | China | |
| Beirut [US Embassy] | Lebanon | |
| Belem [US Consular Agency] | Brazil | |
| Belep Islands (Îles Belep) | New Caledonia | |
| Belfast [US Consulate General] | United Kingdom | |
| Belgian Congo | Zaire | |
| Belgrade [US Embassy] | Yugoslavia | |
| Belize City [US Embassy] | Belize | |
| Belle Isle, Strait of | Atlantic Ocean | |
| Bellinghausen Sea | Pacific Ocean | |
| Belmopan | Belize | |
| Bengal, Bay of | Indian Ocean | |
| Bering Sea | Pacific Ocean | |
| Bering Strait | Pacific Ocean | |
| Berkner Island | Antarctica | |
| Berlin, East [US Embassy] | German Democratic Republic | |
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