About 20km west of Oristano, the Punic and Roman ruins at Tharros are spread across an isthmus that forms the northern tip of the mouth of the Golfo di Oristano. Now overlooked by a sturdy Spanish watchtower, the site was settled by Phoenicians as early as 800 BC, and consists mostly of Punic and Roman houses arranged on a grid of streets, of which the broad-slabbed Decumanus Maximus is the most impressive. The two solitary Corinthian columns marking the site of a first-century-BC Roman temple are in fact a modern reconstruction. Like Nora, there is much more submerged underwater, the result of subsidence.
Near the site stands the fifth-century church of San Giovanni di Sinis, which vies with Cagliari’s San Saturnino for the title of oldest Christian church in Sardinia.