The World Factbook is prepared by the Central Intelligence Agency (CIA) for the use by U.S. Government officials. It provides quick access to information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for select world entities. Each entry is accompanied by a map. The World Factbook also provides quick access to regional, world, and CIA maps.
The National Geospatial-Intelligence Agency (NGA) collects, analyzes, and distribute geospatial intelligence (GEOINT) in support of national security as well as disaster relief.
Although not a product of the U.S. Federal Government, international maps produced by the United Nations are a free and reliable source for geographic information.