The purpose of this feature class is to show areas that are National Marine Conservation Areas (NMCAs). Parks Canada is responsible to protect NMCAs and to manage them for visitors to understand, appreciate, and enjoy in a sustainable manner. (See http://www.pc.gc.ca/progs/amnc-nmca/intro_e.asp ) for more information on NMCAs. This POLYGON layer is structured to store attributes for NMCAs that consist of multiple components. (Note, currently, all 4 NMCAs are single polygons, however, future NMCAs may consist of multiple components that require separate records. For this reason, the layer is structured to be compatable with the National Park Components layer and National Historic Site Components layer).