Oneiros
Oneiros[54, 16] is an area south of the Jademir Lake in northern Feralas. It contains many night elf ruins where elite green dragonspawn used to patrol, prior to the Cataclysm.
Within the ruins is a small night elf camp, Dreamer's Rest.
A version of the ruins also exists within the Emerald Dream. Here, Nightmare-corrupted dragonkin can be found under the command of Tyrannikus, some of them protecting dragon eggs.
Oneiros Digsite
The Oneiros Digsite is a Night Elven archaeology dig site that occupies most of the Oneiros subregion.
Trivia
The name for this locale most likely originates from the Greek myth of the Oneiroi, the sons of Hypnos, god of sleep. They were demonic personifications of dreams, and the most powerful of the Oneiroi was Morpheus, God of dreams.[1] A fitting name for the realm of Ysera the Dreamer.