| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Acre | River (basin) | native | 97592 |
| Amazon | River (basin) | native | 12225 |
| Iguazú River | River (basin) | native | 56308 |
| Machado | River (basin) | native | 97589 |
| Magdalena | River (basin) | native | 78646 |
| Neotropical | Zoogeographic realm | endemic | 12225 |
| Paraná | River (basin) | native | 27745 |
| Patos Lagoon | Lagoon | native | 58359 |
| Uruguay | River (basin) | native | 56308 |