| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Adma River | River (basin) | native | 89719 |
| Brahmaputra | River (basin) | native | 118582 |
| Buxa River | River (basin) | native | 89719 |
| Choto Jamuna | River (basin) | native | 100698 |
| Ganges | River (basin) | native | 118582 |
| Irrawaddy | River (basin) | native | 94495 |
| Jayanti River | River (basin) | native | 89719 |
| Oriental | Zoogeographic realm | endemic | 4833 |