This dataset contains vector data (point) showing the locations of Posidonia oceanica banquettes along the Northern Mediterranean coasts and is composed of different subsets of point occurence data. The dataset was compiled by the Hellenic Centre for Marine Research (HCMR, Institute of Oceanography) in collaboration with the partners of the project "POSBEMED: Sustainable management of the systems Posidonia-beaches in the Mediterranean region". Data collection from Spain, Italy, Greece, Cyprus, and France was based both on tailor-made field and desktop surveys that contacted through a series of questionaires targeting on several target groups. For Spain, Italy, Greece, Cyprus, Croatia, and Malta several locations of Posidonia banquettes digitized on Google Earth. Coverage is the territory of the following EU countries: Spain, France, Italy, Croatia, Greece, Malta, and Cyprus. The dataset collected for the purposes of POSBEMED project should not be considered as exhaustive and its careful use is recommended.