The kingdom of diving, snorkelling, sports fishing and birdwatching. With more than 50 square kilometres of territory, this is the second largest island, after Sant'Antioco, in the Sulcis archipelago. Inhabited since prehistoric times and known as "sparrowhawk island" by the Punics, San Pietro is a 40 minute ferry ride from Calasetta or Portoscuso. It is surrounded by jagged cliffs up to 150 metres high that plunge into the sea. The sharp cliffs alternate outcrops and coves with beaches sheltered from the wind and lapped by a transparent sea.

To the north is the romantic panorama of Cala Vinagra: a pebble beach that bathes in emerald green water. To the northwest is a deep inlet that runs through the rocks to an enchanting small beach: Cala Fico. Further west, in the highest point of the island, the impressive promontory Capo Sandalo is dominated by Italy's most westerly lighthouse, built in the 19th century. At the top of the lighthouse, it feels like being suspended between the sea and the sky. Opposite is the islet of Corno, a destination for diving and sports fishing thanks to its abundant fish. To the south, the two pillars known as Le Colonne are the symbol of San Pietro, together with La Conca cove.