| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Caspian Sea | Lake | native | 9953 |
| Danube | River (basin) | native | 4537 |
| Dnieper | River (basin) | native | 26334 |
| Don | River (basin) | native | 26334 |
| Kuban River | River (basin) | native | 59043 |
| Palearctic | Zoogeographic realm | endemic | 4537 |
| Ural | River (basin) | native | 26334 |
| Volga | River (basin) | native | 26334 |