Marine debris is one of the global issues and becomes a challenge for Indonesia as a maritime country. This research focuses on the characteristics of the one the estuaries in DKI Jakarta. The method used in this research by sampling the water at the mouth of the river by using the manta net at different depths and in tidal conditions.          The results showed that the number of microplastic consists of 93 microplastic particles originating from the seven stations. The number of microplastic particles at low tide conditions is 112 particles. The results of microplastic counting obtained weight of 45.7 mg from the seven stations with high tide conditions on the surface. The maximum particle weight value of 16.2 mg found at station 1 in Muara Tiram. Based on the observations at each station, the size of the microplastic obtained range between 1mm to 5mm. The results of observing the characteristics of the forms in the research study have results including fragments, filaments, films, foams, and granules. The microplastics at the estuary come from the ocean and also from the river.