In recent years, global attention to marine litter and plastic pollution has surged. Estimates show that rivers transport upwards of millions of tons of plastic into the oceans every year. Some 95% of that discharge comes from only 10 rivers, 8 of which are in Asia. Amongst those 8 are the Mekong and the Ganges rivers, the lifeblood for hundreds of millions of people in South-East Asia and India. However, scientific knowledge on marine plastic litter and effective countermeasures remains insufficient to tackle the problem properly.