The map shows the spatial distribution of the frequency of oil spills in the Mediterranean Sea, indicating where the probability of an oil discharge is higher. Oil spills were represented as a density layer calculated using data on ship accidents and oil discharges registered by the Mandate of the Regional Marine Pollution Emergency Response Centre for the Mediterranean Sea (REMPEC), and also the oil spills map generated by Cinirella et al., 2012 (based on JRC data, 2009).