Marine litter is any persistent, manufactured or processed solid material discarded, disposed of or abandoned in the marine and coastal environment. This definition includes items originating from land or sea-based sources. Source: UNEP Marine Litter webpage here: https://www.unep.org/explore-topics/oceans-seas/what-we-do/working-regional-seas/marine-litter#:~:text=Marine%20litter%20consists%20of%20items,at%20sea%20in%20bad%20weather.