Lullabee Island was a island in the center of North Lake in the Free Glades that was completely covered with a thick grove of lullabees. The Oakelf Brotherhood lived on the island, and only those with their permission could visit. Rook visited Lullabee Island during the events of Freeglader, and, upon the instructions of the Oakelves, slept in a caterbird cocoon for two weeks.
After Maris Pallitax left Twig with the Woodtrolls and founded the Free Glades with Tweezel, she spent most of her days within a Caternest on Lullabee Island. Keris, Twig's daughter, would later find Maris in the exact same Caternest many years later during the events of The Slaughterer's Quest.