The protected marine area Sinis Peninsula - Mal di Ventre Island is a marine area located west of the city of Oristano that protects the environment including the Sinis Peninsula, characterized by a varied rocky and sandy coast, the Mal di Ventre Island, and the Scoglio del Catalano.

The importance of the area derives from the tourist impulse it has received only in recent years, which has allowed it to evolve from a fishing village to a paradise location that welcomes tourists from all over the world.