(Cimandiri, Ciliwung) : ReCleanSea (http://recleansea.org/) was awarded a grant by IFI (Institut Français Indonesia) with its Science & Impact program. The Non-Profit Organisation’s proposal consisted in having OceanKita in partnership with BRIN (Badan Riset dan Inovasi Nasional) to conduct a study on Cimandiri river (West Java), near the estuary, focused on land-based sources plastic litter in the river. Four sampling campaigns, from December 2020 until October 2021 were conducted using our 1T trawl-net. A scientific report will be published early 2022. A less ambitious sampling campaign, using this time a 2T boom was conducted in November 2021 on Ciliwung river, Depok, with the additional participation of Universitas Indonesia.