have caused changes in the hydrodynamics and the contribution of sediments to the Cispatá Bay [6].Using 210 Pb technique, we dated a sediment core collected in Cispatá bay in 2019 to evaluate the temporal trends of sediment accumulation rates (SAR) in the last century, under the hypothesis that changes in the input of sediments to the bay are related to the changes in the channel of the Sinú River.The results achieved will be valuable to understand the role of changes in the Sinú River delta, erosive processes, textural features, and pollution trends. Methodology Area of StudyCispatá Bay is located in the Colombian Caribbean Coast, enclosed in The Mestizos peninsula on the western side of the Morrosquillo Gulf (Figure 1), Cordoba department, between 09°25'12"-09°20'8"N and 75°47'37"-75°55'30"W [7,8].The Bay is a Holocene depositional landform formed by Rio Sinú before its diversion occurred between 1937 and 1945, when the Tinajones delta started to grow [6].Rio Sinú is one of the most important fluvial systems of the Colombian Caribbean, draining the Andes with a total length of about 415 km and is a very intervened catchment area of 17,000 km 2 .Its mean discharge is about 398.09 m 3 /s (max.858.2 m 3 /s, min.29.1 m 3 /s) [9] and its sediment load is estimated to be in the order of 4.2 million t/y [10].The bay has a tropical climate affected by Intertropical Convergence (ITC) annual displacements between the latitudes 5°S and 15°N, which produces an arid xerophytic savanna climate, with annual mean temperatures of 28.3°C (max.28.8°C in January and