Unusual World Map

To communicate spatial information effectively, features such as rivers, lakes, and cities need to be labeled. Over centuries cartographers have developed the art of placing names on even the densest of maps. Text placement or name placement can get mathematically very complex as the number of labels and map density increases. Therefore, text placement is time-consuming and labor-intensive, so cartographers and GIS users have developed automatic label placement to ease this process.
Non geographical spatial maps
Maps exist of the solar system, and other cosmological features such as star maps. In addition maps of other bodies such as the Moon and other planets are technically not geological maps.