This report provides integrated information on marine litter ranging from mega to micro sizes according to the spatial existence. It reviews the research on marine litter's impact on wildlife, tourism, fisheries, navigation, human health, and food safety, and provides an overview of NOWPAP Member States’ actions to address marine litter. The report also assesses the implementation of the NOWPAP Marine Litter Action Plan in the past decade. The report is a joint product of Our Sea of East Asian Network (OSEAN) and NOWPAP.