Marine Ecoregions of the World
Definitions
Realms capture the highest levels of biological diversity - wide tracts of coasts and shelves with broad similarities reflecting influences of temperature and of evolutionary history.
Provinces are distinctive sub-units of realms often centered on seas or semi-enclosed basins, sometimes with highly distinctive biotas and endemic species.
Ecoregions, or ecological regions, capture areas of relatively homogenous species composition. These are the finest scale units within the MEOW and represent a realistic "jumping-off point" for practical on-the-ground conservation.
More complete definitions are provided in the CBD report.
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