Also known as "special purpose maps". These maps have a specific theme or topic such as amusement park maps, zoo maps, climate maps, maps of malls, region maps, museum maps, and so on:

They are used to explain features not visible but exist

Explanation:

Special purpose maps are also known as thematic map, they are a type of map that displays a particular theme regarding a geographical area on a map. This involves the use of map symbols to give a picture of properties of a geographical location that are not visible, such as amusement park maps, zoo maps, climate maps, maps of malls, region maps, museum maps.