A western tributary system flowing from the lower Kilbyurn range. The Ilyu is smaller than the Mydruli but significant as the primary water source for the western plains.
The river crosses terrain that the satyr claim is haunted—camps along the Ilyu report more disturbances than elsewhere, and several tributaries are avoided entirely. The satyr won't explain why. Whatever the cause, the western plains near the Ilyu are less densely occupied than the eastern regions.