| Category | Lakes |
| Continent | Brucrumus |
| Region | Tribe Steppes |
| Map | Morteban |
Lake Nírië was once five times its current size, stretching all the way to the foul waters of the Imsavild swamp. During the Demon Spawn War, the Nírië Whirlpool rift was created to flood the central valley of the Isterien mountains. This was done to eliminate one of Demogorgon's armies that had become deeply entrenched, making it impossible for Covenant forces to attack them without suffering severe losses. The whirlpool, a rift drawing water from this lake and disgorging it into Lake Sondicar, remains active. This provides a quick means of reaching Sondicar and its two elven cities, so some utilize this rift as a method of travel.
The primary sources of inflow into Lake Nírië are a pair of easterly flowing rivers that originate at the base of the Harongrand plateau.