The project "Inventario e Cartografia delle Praterie di Posidonia nei Compartimenti Marittimi di Manfredonia, Molletta, Bari, Brindisi, Gallipoli e Taranto" was funded bt the Apulian Region within the framework of the POR 2000-2006. The project was conducted by CRISMA with the involvement of the fischery operators and in cooperation with Nautilus and COISPA cooperatives. The scientific supervision was in charge of Prof. Tursi (Univ. BARI), Prof. Boero (Univ. Lecce), Dr. Gambi (SZN), Dr. Lembo (COISPA), Dr. Sandulli (Univ. Bari) and Dr. Torchia (Nautilus).The fileld surveys were conducted using SSS, two frequence single-beam and ROV with a position accuracy of few meters. A total of 433 transects over more than 2000 km were carried out covering a total surface of about 700 kmq.