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Belawan is the largest port serving North Sumatra for the import and export.Port has facilities for handling container, CPO liquid bulk cargo,Oil,and other agriculture products.Its location is at the fiver mouth which is subjected to the heavy sedimentation especially after many deforestation activities in its catchment area. The numerical modeling was developed for predicting the rate of sediment caused by erosion in the catchment area for several scenarios.This predicted rate of sediment was applied as input to model of sedimentation in the ocean.Present condition of sedimentation data was used as calibrated data.This integrated model was used to simulate the sedimentation in Belawan access channel and harbor basin for several development plans.