Posidonia is the story of Tabarca, the smallest inhabited island in the Mediterranean Sea. The island seems a different one in each season: the colors, the sounds, the people. Its inhabitants are called “Tabarquinos”. They have a peculiar character, with a Genoese background of pirates and fishermen, magnified by the isolation and hardness of the island, especially during the winter. This has helped the island to keep its treasures, such as the Posidonia, an acuatic plant which the island shelters and cares for. In its seabed hundreds of species coexist, but like any jewel, it also suffers threats, mainly from man during the long and crowded summers. In addition, the lack of investment puts at risk the conservation of the marine reserve, its history, legends and magic, and its inhabitants.