The highest peaks are the Montagna Grande (), the Rocca di Novara (), the Pizzo di Vernà (), the Monte Poverello () and the Monte Scuderi (). The range is made up of a long series of peaks, with an average height of , intermingled with ridges and ravines. The deep gorges house numerous streams that create the typical rivers of this land called , often full of deprises in their inferior flow. The most common rocks are of igneous and metamorphic origin. Sandstone soils are also present. Of unusual origin are the megaliths rocks of the Argimusco plateau.