Regions can include states, counties, zip codes, census tracts, or block groups.
For example, a city boundary which includes an unincorporated area within its boundary would contain a lake. For example, a city boundary in a large unincorporated area would be a geographic island since there would be no other cities adjacent to it. Points are typically used to depict address locations. Also, points may sometimes be used to depict regions when the map is at a large scale. For example, city boundaries on a map of the entire United States would not normally be large enough for boundaries to be discernable, so they would be depicted with a point instead.