 Between these last two, in the place named "Tre Valloni", are the sources of the Titerno whose waters join with those of the torrent named "Acqua Calda" and, coasting along the buttress of Mount Mutria, they go down in the plain of Cusano Mutri passing through a canyon, delimited to north from the rocky table named Civita of Cusano Mutri and to south Civita of Pietraroja.In the Moschiaturo mountain is the source of other principal torrent, the Torbido, which crosses Métole and Potéte to east and to south of Pietraroja and flows in the plane of Civitella Licinio, hamlet of Cusano Mutri in which it meets the Titerno.Pietraroja has Samnite origin and has occupied various sites in its territory, currently on its fourth definitive site erected after the catastrophic earthquake of June 5, 1688.