"is a collection of world map data, consisting of vector descriptions of land outlines, rivers, and political boundaries. It was created by the U.S. government in the 1980s and has a nominal scale of 1:5,000,000."(Quoted from http://bioval.jrc.ec.europa.eu/products/gam/sources.htm)
The text file version converted by Dave Page is available on this website.
Geographic data from World DabaBank II is updated by Natural Earth.