| Category | Forests |
| Location | Sea of Mourning |
| Region | Aerie of Dragons |
| Map | Iizus Yeldah |
Irengor is an exceptional kelp forest situated off the southeastern coastlines of Feykro Kes. The seaweed is lush and stretches upwards to 400 feet from the sea bed. Some of the vegetation reaches the surface, forming dense tangles of plant life that are so thick an elf can traverse them. These patches can pose a challenge during the summer months for vessels sailing through the region. Fortunately for mariners, the sea elves of Merenwen are always close at hand to assist those bearing a token of friendship.
In the Demon Spawn War, Irengor was magically enhanced, causing it to grow faster and larger. The region became akin to a verdant jungle under the arcane influence of the archangel Tularra. Within this expansive kelp-filled domain, numerous outposts, encampments, fortifications, and innumerable traps were established. This forested area, alongside Merenwen and Elbothiach, served as a strategic depot for Tularra's armies as they battled the demon hordes of Gorag'theg emerging from the Sôvuk Sea Gate.
Irengor is strewn with the remnants of battles fought here during the God Era. Many of these areas are overgrown and forgotten, often serving as the lair of bandits, giant squid, or other undersea creatures. The most prominent ruin is Elbothiach. This place was sacked by the demons and cursed by Gorag'theg. The curse, which not even the archangel Tularra could break, dictates that any creature dying here rises as the undead. The people of Merenwen claim the most terrifying entities emerging from the area are giant undead sharks, even more ravenous than when they were living.
The undersea city-state of Merenwen claims Irengor as its territorial domain.