The following regions have been established in the APAIS Thesaurus to cover the whole of the world at a general level:
Atlantic Ocean region
Indian Ocean region
Pacific Ocean region
Some countries may be included in more than one region. For example, Mexico can be regarded as part or either North America or Central America, depending on the point of view of the article being indexed. Because of the amount of material indexed in APAIS, the following countries have been separately established as descriptors:
Papua New Guinea
All other geographic names not in the Thesaurus will appear as identifiers, provided the term has not already appeared elsewhere in the record. For the countries not listed above, the appropriate region is indexed as a descriptor with a cross reference in the References field from the name of the country, e.g.Mexico Use: Central America. The same pattern of descriptors and cross-references is used for Australian towns other than capital cities and suburbs within capital cities, e.g. Cairns Use: Queensland;
Bondi Use: Sydney.
See Appendix 2.3 for subdivisions associated with geographic descriptors.