| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Baltic Sea | Sea/Bay/Gulf | native | 83294 |
| Danish islands basins | River (basin) | native | 59043 |
| Denmark river drainages and lakes | River (basin) | native | 59043 |
| Elbe River | River (basin) | native | 59043 |
| Ladoga Lake | Lake | native | 59043 |
| Neman (Niamunas) River | River (basin) | native | 59043 |
| Northern Atlanto-Baltic river drainages and lakes | River (basin) | native | 59043 |
| Oder | River (basin) | native | 59043 |
| Onega River | River (basin) | native | 59043 |
| Palearctic | Zoogeographic realm | endemic | 13696 |
| Rhine | River (basin) | introduced | 59043 |
| Southern Baltic Coastal river drainages and lakes | River (basin) | native | 59043 |
| Vistula | River (basin) | native | 59043 |
| Weser | River (basin) | native | 59043 |
| Åland basins | River (basin) | native | 59043 |
| Öland basins | River (basin) | native | 59043 |