I live at the end of the Pearl River Delta and regularly cross it by boat and travel along the shoreline. There is not a great deal of surface-visible physical

I live at the end of the Pearl River Delta and regularly cross it by boat and travel along the shoreline. There is not a great deal of surface-visible physical plastic trash floating out of the river. Especially additionally considering the huge number of people living here (~100M+ within 100km radius), it is very well collected and managed versus rivers in the developing world. None of that mud-mixed-with-plastic-refuse buildup you often see in, say, India, Thailand, or undredged canal systems.