The westerly Mount Hasan, central and easterly form a mountain range, which is surrounded by plains and whose summits reach heights of over . Of these mountains, is more heavily eroded compared to the steep cones of Hasan and like is of early Pliocene age. It and to some degree Mount Hasan are also surrounded by a large depression. Additionally, Mount Hasan forms a volcanic lineament with and the Karapınar Field.