This report provides integrated information on marine litter ranging from mega to micro sizes according to the spatial existence. It reviews methodologies used for distribution surveys (target size, site number, sampling location, date, seasonality, interval, measuring units, citizen science, technical aspects, etc.), showing similarity and difference. It shows the abundance of marine litter and compares them among countries by figures or tables in three compartments like beaches, seawater, and sea bottom and tries to figure out temporal trends