The river flows first to the south through the "comuni" of Cittareale and Posta and goes into a narrow valley with the "Monte Terminillo" to the west and the "Monte Giano" to the east; after about , it leaves the valley and gets in the Antrodoco "comune". The river then turns to the west and flow through the "comuni" of Borgo Velino and Castel Sant'Angelo. Then the river gets the water of the "Peschiera Springs".