marine ecoregions
   (Biogeographic realm) Tropical Atlantic
     (Biogeographic province) Gulf of Guinea
       81 (Marine ecoregion) Gulf of Guinea West
       82 (Marine ecoregion) Gulf of Guinea Upwelling
       83 (Marine ecoregion) Gulf of Guinea Central
       84 (Marine ecoregion) Gulf of Guinea Islands
       85 (Marine ecoregion) Gulf of Guinea South
       86 (Marine ecoregion) Angolan