The Custoni Plains are the expanse of grassland West of the Cape of Atmaut, North of the Custoni River, East of Beregard Forest and the Itast Mountains, and South of the Arngard River and the Desert of Bleached Bone. The plains are home to the city of Custon, the towns of Anccon and Dricul, and the forts Arngard and Ganggard.