Three sediment cores were collected from Moulay Bouselham lagoon in Northern Morocco. This dataset focuses on blue carbon-related data, including sediment core information, organic carbon, inorganic carbon, and total carbon content measured in each sediment layer (every 2 cm). It also provides extrapolated data of OC and DBD along with the accumulated carbon stocks in the top 1 m of the three cores. Three sediment cores were collected from Moulay Bouselham lagoon in Northern Morocco. This dataset focuses on blue carbon-related data, including sediment core information, organic carbon, inorganic carbon, and total carbon content measured in each sediment layer (every 2 cm). It also provides extrapolated data of OC and DBD along with the accumulated carbon stocks in the top 1 m of the three cores.