Two thousand years of traffic have crossed the seven arches of the bridge over the Mannu River. It was built after the foundation of Turris Libisonis to link it to the mines and corn fields of Nurra, and was in use up to the 1980s. The 135m long bridge slopes sharply, due to the different heights of the river banks. On the east side of the bridge you can still see a part of the original road surface.