Creating new donut holes and island polygons
Sometimes you need to create a polygon with a hole in it or even a polygon with both a hole and an interior polygon. To create these kinds of polygons, you need to create a multipart feature.
Islands, or island polygons are common in spatial data, for example an island may represent features such as enclosed areas of water such as lakes, or parks within urban areas.
See also: Mapping, Boundary, Digitize, Feature, Attributes