Aroanios River has his sources at the foothills of Helmos at the area of Planitero, it crosses the valley of Katsanas and it meets the torrents of Kleitora and the river Ladon, with which unites to reach the artificial lake in Daphni.
The whole area is watered by Aroanios and is characterized by vegetation that thrives and is declared as a monument of nature. Perennial trees, crystal clear waters, and water mills of high architectural aesthetic accompany the Aroanios River of several myths and traditions.