Regions (3)
| Baltic Sea |
| Black Sea |
| Mediterranean Sea |
| North East Atlantic Ocean |
Subregions (2)
| Adriatic Sea |
| Aegean-Levantine Sea |
| Barents Sea |
| Bay of Biscay and the Iberian Coast |
| Black Sea - sea of Azov |
| Celtic Seas |
|
| Greater North Sea, incl. the Kattegat and the English Channel |
| Iceland Sea |
| Ionian Sea and the Central Mediterranean Sea |
| Macaronesia |
| Norwegian Sea |
| Western Mediterranean Sea |
| White Sea |
|