The OMM, Osservatorio del Mare a Molfetta (Molfetta Sea Observatory), is an association of voluntary citizens that promotes participatory monitoring of the marine and coastal environment, i.e. a system of study and control of the territory that directly involves the local population. In fact, citizens are the best observers, both during the systematic collection of data and in the subsequent phases of formulation of management plans aimed at the eco-sustainable development of the territory.