National Geographic: A site full of articles, maps, statistics, and geography adventures.

Atlapedia: Full color physical and political maps, plus facts and statistics on countries of the world.

50 States: Great general information on all fifty US states.

State Master: Great general information about the fifty states, PLUS, a statistical database which allows you to research and compare a multitude of different data on US states.

Nation Master: Great general information about all the world's countries, PLUS, a statistical database which allows you to research and compare a multitude of different data. Users are able to create their own graphs.

Worldgeo: Facts and Information about the world's countries.

The World Fact Book: Maps, facts, statistics, and background information about every country in the world. Maintained by the CIA.