The fluminense north coast region of Rio de Janeiro comprises a large coastal geomorphological domain in the state, formed by Quaternary deposits where they developed from successive variations in sea level as well the contribution of River and marine processes allowing the development of a complex delta in an extensive region. The current sedimentation stage of this complex is represented by the holocenic delta of Paraíba do Sul, built after the last marine transgressive maximum. From the 2000s onwards, a series of works have been dedicated to understanding the detailed evolutionary aspects of these regions, especially the coastal plains located on the south and north of the current mouth. These plains have important geomorphological contrasts, due to the occurrence of distinct evolutionary processes responsible for coastal progradation. To the north of the mouth, the presence of a coastline marked by the presence of beach ridges interspersed with muddy depressions stands out, the result of the successive incorporation of barrier-lagoon systems, formed from the emergence of initially submerged sandy barriers. Recently researches investigated of the morphodynamic mechanism responsible for the formation and evolution of the coastal barriers present in the northern delta plain, as well as gathered a series of evidence associated with ancient environments that indicate the process currently underway on the coast would have been responsible for much of the Holocene plain located north of the River mouth. In the context this research aims to characterize the current sedimentation environment in terms of morphology and sedimentation, making it possible to relate the mechanism currently in progress with the previous records studied. For this, surveys, morphodynamic monitoring, sediment collection, bathymetry were carried out as well as photointerpretations. In the laboratory, granulometric analyzes, quantification of carbonates and organic matter were carried out, allowing for the correlation of surface data with subsurface in order to obtain better precision in the interpretations. This research showed that formation process of the Holocene plain is the same in progress today, added a better and more detailed understanding of the local morphodynamics, suggesting that the hydrosedimentary energy of the Paraíba do Sul River has been decreasing in recent years.