Creating a fictional country is a favorite pastime for quite a few on the net. With sites like http://www.nationstates.net/page=welcome, http://www.cybernations.net/, and http://micronations.wikia.com/wiki/Main_Page there are quite a few examples to choose from.

However, one of the most impressive examples I have come across is the Continent of Norscand at http://norscand.net/news.shtml. Home to four fictional countries, the sheer amount of work put into the site is incredible--as are the maps, some of which approach A2area quality. (Warning: very large files) Take a look at the continental map: http://www.norscand.net/images/norscand-overview.png, the map of the City of Yordam: http://www.norscand.net/images/yordam-metro-area.png, and the maps of the City of Yogo: http://www.norscand.net/regional/scansey/yogost.shtml. In addition, there are numerous road and transit maps for all four countries.