| النظم البيئية | نوع | الحالة | مرجع |
|---|---|---|---|
| Danube | River (basin) | native | 50943 |
| Dnester | River (basin) | native | 50943 |
| Hron | River (basin) | native | 59043 |
| Palearctic | Zoogeographic realm | native | 50943 |
| Some? | River (basin) | native | 59043 |
| Tisza | River (basin) | native | 50943 |
| Vistula | River (basin) | native | 50943 |
| Wierzyca | River (basin) | native | 59043 |