Fenris Isle is a large island located in the center of Lordamere Lake. The island is generally considered to be a part of Silverpine Forest, and together with the Dawning Isles, form a broken circle of dry land in the lake.
When the undead Scourge took the land, Fenris Isle was abandoned, all of its inhabitants either fled or murdered. The island has since been occupied by the Rot Hide gnolls, who have taken the keep as their base of operations. The Rot Hides are led by their treacherous master, Thule Ravenclaw, who has taken complete control of the island and the nearby Decrepit Ferry.