This data set is associated with the manuscript draft entitled "How is particulate organic carbon transported in the Congo-River-fed Submarine Canyon to the deep-sea"? accpeted for publication in the Journal EGU Biogeosciences on 18 August 2024. The dataset includes grain-size measurements, total organic carbon contents, carbon stable isotopes and radiocarbon ages on sediment samples collected in a sediment trap and multi-cores in the Congo Submarine Canyon at 2 km of water depth.