| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Alazeya River | River (basin) | native | |
| Amguema River | River (basin) | native | |
| Anadyr River | River (basin) | native | |
| Indigirka River | River (basin) | native | |
| Kolyma | River (basin) | native | |
| Palearctic | Zoogeographic realm | endemic | 12323 |
| Pechora | River (basin) | questionable | 26334 |