| Significance | River |
| Northern Border of Rohan | |
| The Grey Havens are at its mouth | |
| The Nazgul were swept away at its fords | |
| In the Morgul Vale, its water is poisonous | |
| Named after a lost Elven maiden | |
| Begins in the Iron Hills (hence the color) | |
| From Erebor to the Sea of Rhun | |
| It passes through Lorien | |
| The Gate Stream of Khazad-dûm | |
| Both Dunharrow and Edoras sit along it | |
| The main river of the Shire | |
| Where Tom found the River Daughter | |