San Domino, San Nicola, Capraia, Cretaccio and Pianosa, a less-than-300-hectares surface far from Gargano's northern coast: they are the ancient Diomedeae, where Homer set the last dwelling of the legendary hero and friend of Ulysses. Since 1989 they have been a Marine Protected Area. Since they have been submerged several times in the course of their geological history, and thanks to their calcareous nature, they feature a large number of marine caves.
Only the circumnavigation by boat allows visitors to fully appreciate the beauty of its coasts featuring rocky bays, steep cliffs and natural holes, where the Diomedea nest. According to the legend, Diomedes' companions were turned into birds by Aphrodite, and they still mourn the death of their hero.