The Adriatic Sea is a semi-closed pool with slow streams, making it vulnerable to pollution. Marine Litter (ML) is defined as any solid, manufactured or processed solid material discharged into the marine and coastal environment. The prevailing part of marine waste consists of plastic materials. Specifically, micro-plastics is an increasing cause for concern for the degradation of the marine and coastal ecosystems, potentially endangering the functionality of the ecosystem itself and reducing the quality of coastal waters for fishing and tourism. Furthermore, cross-border effects are already known in marine litter, with a floating sea layer of waste that travels regardless of the state / administrative boundaries of a country.