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5 continental regions, including offshore waters and islands out to 200 nautical miles, or half the distance to a nearby continent, plus Antarctica in South Polar region (see its definition).
3 oceanic regions, including ocean and islands more than 200 nautical miles from a continent and its 'inshore' islands or island groups.
THE NORTH AMERICA REGION
The North America Region includes all of the Aleutian Islands, and is divided from Eurasia by a line in the Bering Sea running midway between Attu, St. Matthew, St. Lawrence, and Little Diomede islands on the North American side, and Mednyy (in the Commander Islands), the Siberian coast, and Diomede Island on the Eurasian side. The North America Region includes other related islands within 200 nautical miles of the Pacific and Atlantic coasts; the Bahamas, all of the cays and islands lying between Nicaragua and Jamaica, and all of the Greater and Lesser Antilles south to and including Grenada and Barbados (but excluding Trinidad and Tobago and the other Caribbean islands specifically included in the South American Region). The North America Region includes all of Panama, and extends across the Caribbean Sea halfway to South America and its related islands.
THE SOUTH AMERICAN REGION
The South America Region includes the entire continent from the Panama/Colombia border south to Cape Horn, and includes Fernando de Noronha, Trinidad, Tobago, the Venezuelan islands near 12 degrees north latitude, Bonaire, Curacao, and Aruba; and extends across the Caribbean Sea halfway to North America and its related islands. Excluded are Isla de Malpelo (west Of Colombia), the Gala pagos Islands, and the Falkland Islands.
THE EURASIA REGION
The Eurasia Region includes Europe and Asia. The European portion includes Malta, Great Britain, Ireland, and the Hebrides, Rockall, and Shetland Islands, but excludes the Faeroe Islands and Iceland. Included in the Asiatic portion are Wrangel, Diomede, and the Commander Islands, the Izu Islands (excluding Nampo Shoto and the Daito Islands), the Ryukyu Islands, the Philippines, and Indonesia east through the entire Banda Arc (Greater and Lesser Sundasj to Timor and Tanimbar. Eurasia includes the Andaman and Nicobar Islands, and Lakshadweep (the Laccadive Islands). Excluded are the Maldives and Christmas Island in the Indian Ocean. The dividing line between Eurasia and Australasia in Indonesia runs through the Banda and Molucca Seas, with Sulawesi (Celebes), Banggai, and Talaud on the Eurasian side, and the islands of Kai, Ceram, Buru, the Sula group, and Morotai on the Australasian side. The Suez Canal separates Eurasia from Africa.
THE AFRICA REGION
Tlhe Africa Region includes Socotra in the Arabian Sea, Sao Tome and Annobon in the Gulf of Guinea, and the Canary Islands, but excludes Madeira. The Africa Region does not include Madagascar or the Comoro Islands which are in the Indian Ocean Region.
THE AUSTRALASIA REGION
The Australasia Region includes Halmehera and the Moluccan rslands, New Guinea (with Waigeo, Biak, Woodlark, and the Louisade Archipelago), the Admiralty Islands, and the Bismarck Archipelago; but excludes Green Island, Bougainville, the Solomon Islands, and the Micronesian islands of Tobi, Helen, and Kapingamarangi.
THE SOUTH POLAR REGION
The South Polar Region includes all land and ocean south of 52 degrees south latitude in the Atlantic and Indian Oceans, and south of 56 degrees south latitude in the Pacific Ocean. Where 56S in the Pacific reaches the 200 nautical mile pelagic belt of South America, the boundary follows the edge of the palagic belt around the tip of South America and northward in the Atlantic Ocean to 54S, thence eastward to 50 degrees west longitude, thence northward to 52 degrees south latitude, thence eastward to 147 degrees east longitude (the boundary of the Pacific Ocean Region), thence southward to 56S. This boundary approximates the Antarctic Convergence. The South Polar Region includes Shag Rocks, South Georgia, Bouvet (near 5E), and the Heard Island group. Excluded are the Falkland Islands, Kerguelen, and Macquarie Island.
THE OCEAN REGIONS
The Atlantic/Arctic Ocean Region, Pacific Ocean Region, The Indian Ocean Region. The Ocean Regions include all oceans and islands not included in any Continental Region nor its pelagic belt. Each extends south to 52 or 56 degrees south latitude, as defined for the South Polar Region.
THE HOLARCTIC REGION
List of Recent Holarctic Bird Species" by K.H.Voous, published by the BOU in 1977 and 1980 defines the Holarctic Region as "the cold and temperate regions of the northern hemisphere" Nearctic, Western Palearctic and Eastern Palearctic regions combined. See Mark Beaman's "Palearctic Birds", pp.10-13, Harrier Publications, 1994 for defining southern Palearctic limits.
Many thanks to Peter Landry for this list suggestion.