Arbatax is the largest hamlet of Tortoli, located in the province of Ogliastra. Its name derives from the Arabic "arba'at'ashar", meaning “fourteenth tower”, referring to the light house located on the cast. The former fishing village has been transformed into a fairly important harbour. The village itself is renowned for the red cliffs ("rocce rosse") disappearing into the blue waters. It’s also the terminal station of the narrow-gauge railroad of the Trenino Verde.