| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Aegean Sea | Sea/Bay/Gulf | native | 113897 |
| Atlantic Ocean | Sea/Bay/Gulf | native | 173 |
| Balearic basins | River (basin) | native | 59043 |
| Balearic Islands | Sea/Bay/Gulf | native | 95727 |
| Balkan river drainages and lakes | River (basin) | native | 59043 |
| Baltic Sea | Sea/Bay/Gulf | native | 36252 |
| Barents Sea Islands basins | River (basin) | native | 59043 |
| Barents Sea river drainages and lakes | River (basin) | native | 59043 |
| Bay of Biscay river drainages and lakes | River (basin) | native | 59043 |
| Beaufort Sea | Sea/Bay/Gulf | native | 173 |
| Black Sea | Sea/Bay/Gulf | native | 4645 |
| British islands basins | River (basin) | native | 59043 |
| Bug | River (basin) | native | 59043 |
| Canary Current | Sea/Bay/Gulf | native | 35388 |
| Caspian Sea | Lake | introduced | 59043 |
| Celtic-Biscay Shelf | Sea/Bay/Gulf | native | 35388 |
| Central Arctic | Sea/Bay/Gulf | native | 173 |
| Central Turkey river drainages and lakes | River (basin) | native | 59043 |
| Corsica Island | Sea/Bay/Gulf | native | 96325 |
| Cote Azur | River (basin) | native | 59043 |
| Crete Island | Sea/Bay/Gulf | native | 113897 |
| Crimean Peninsula | River (basin) | native | 59043 |
| Danish islands basins | River (basin) | native | 59043 |
| Danube Delta | River (basin) | native | 59043 |
| Denmark river drainages and lakes | River (basin) | native | 59043 |
| Dnester | River (basin) | native | 59043 |
| Dnieper-Bug Liman | River (basin) | native | 59043 |
| Don | River (basin) | native | 58293 |
| Don Delta | River (basin) | native | 59043 |
| East Siberian Sea | Sea/Bay/Gulf | native | 4645 |
| Eastern Black Sea | River (basin) | native | 59043 |
| Eastern Mediterranean river drainages and lakes | River (basin) | native | 59043 |
| Elbe River | River (basin) | native | 54732 |
| Faroe islands basins | River (basin) | native | 59043 |
| Galician Shelf | Sea/Bay/Gulf | native | 57747 |
| German Bight | Sea/Bay/Gulf | native | |
| Gotland basins | River (basin) | native | 59043 |
| Greek islands basins | River (basin) | native | 59043 |
| Iberian Coastal | Sea/Bay/Gulf | native | 35388 |
| Iberian main basins | River (basin) | native | 59043 |
| Ionian Sea | Sea/Bay/Gulf | native | 113897 |
| Ireland river drainages and lakes | River (basin) | native | 59043 |
| Irish Sea | Sea/Bay/Gulf | native | 9488 |
| Italy main basins | River (basin) | native | 59043 |
| Krinka | River (basin) | native | 59043 |
| Kuban River | River (basin) | native | 58296 |
| Laptev Sea | Sea/Bay/Gulf | native | 4645 |
| Loire | River (basin) | native | 30578 |
| Lower Danube | River (basin) | native | 59043 |
| Lower Dnieper | River (basin) | native | 59043 |
| Mediterranean Sea | Sea/Bay/Gulf | native | 173 |
| Mezen' River | River (basin) | native | 26334 |
| Neman (Niamunas) River | River (basin) | native | 59043 |
| Neva River (Ladoga Lake exclusive) | River (basin) | native | 26334 |
| North Aegean | Sea/Bay/Gulf | native | 113897 |
| North Sea | Sea/Bay/Gulf | native | 173 |
| Northern Atlanto-Baltic river drainages and lakes | River (basin) | native | 59043 |
| Norwegian Sea | Sea/Bay/Gulf | native | 173 |
| Oder | River (basin) | native | 59043 |
| Onega River | River (basin) | native | 59043 |
| Palearctic | Zoogeographic realm | native | 173 |
| Pechora | River (basin) | native | 59043 |
| Po | River (basin) | native | 59043 |
| Prut | River (basin) | native | 59043 |
| Rhine | River (basin) | native | 59043 |
| Rhône | River (basin) | native | 59043 |
| Sakarya Nehri | River (basin) | native | 59043 |
| Sal | River (basin) | native | 59043 |
| Sarata | River (basin) | native | 59043 |
| Sardinia Island | Sea/Bay/Gulf | native | 13729 |
| Sava River | River (basin) | native | 59043 |
| Sea of Azov | Sea/Bay/Gulf | native | 26334 |
| Sea of Azov river drainages and lakes | River (basin) | native | 59043 |
| Sea of Marmara | Sea/Bay/Gulf | native | 57855 |
| Seine | River (basin) | native | 59043 |
| Shetland islands basins | River (basin) | native | 59043 |
| Sicily basins | River (basin) | native | 59043 |
| South Aegean | Sea/Bay/Gulf | native | 113897 |
| Southern Baltic Coastal river drainages and lakes | River (basin) | native | 59043 |
| Syvash abo Gnyle more | River (basin) | native | 59043 |
| Tagus | River (basin) | native | 51031 |
| Thermaikos Gulf | Sea/Bay/Gulf | native | 113897 |
| Vistula | River (basin) | native | 59043 |
| Weser | River (basin) | native | 59043 |
| White Sea | Sea/Bay/Gulf | native | 124243 |
| Yenice Irmagi | River (basin) | native | 59043 |
| Åland basins | River (basin) | native | 59043 |
| Öland basins | River (basin) | native | 59043 |