NGA GEOnet Names Server (GNS). The U.S. official repository of standard spellings of all foreign geographic names, sanctioned by the United States Board on Geographic Names (US BGN). All the geographic features in the database also contain information about location (latitude & longitude), administrative division, etc. and link to the feature on a map.
See Also: Research Guides under "International Organizations" below (some sites also provide information on individual countries).