A field type called Geospatial Data is available in Cartaro and can be used to define custom content types. Those fields can hold map features of common types and contain an unlimited number of features, each. You would define your content structure as usual but also add
Geospatial Data fields.
You can choose to either provide or view your data as WKT or on a map. WKT is a simple text base format to specify spatial data. An example of using a map for editing with point, line and area features follows.
More information can be found in the documentation of the PostGIS module.