Po Delta. The Delta Park is the largest among the regional parks. It occupies the major portion of the territory of the regions of Veneto and Emilia Romagna, from Porto Tolle in Ravenna, via Po of Goro, the Valleys of Comacchio, the Piallasse Ravenna, the Saline di Cervia, inland wetlands freshwater Valleys Campotto, woods and pine forests, such as the Forest of Mesola and the Pinewood of San Vitale.