The Sinis Peninsula on Sardinia’s west coast features a dynamic geological history. In ancient times, this landmass was an offshore island separated from mainland Sardinia by sea channels and marshes. Over millennia, river and ocean sediments filled in the water gaps, permanently joining the peninsula to the mainland. This natural process left behind a vast system of saltwater lagoons and wetlands that today serve as protected nature reserves and crucial stopover points for migratory birds.