marine ecoregions
   (Biogeographic realm) Temperate Northern Atlantic
     (Biogeographic province) Northern European Seas
       20 (Marine ecoregion) South and West Iceland
       21 (Marine ecoregion) Faroe Plateau
       22 (Marine ecoregion) Southern Norway
       23 (Marine ecoregion) Northern Norway and Finnmark
       24 (Marine ecoregion) Baltic Sea
       25 (Marine ecoregion) North Sea
       26 (Marine ecoregion) Celtic Seas