<![CDATA[Mangrove ecosystems are important coastal habitats that store blue carbon and are relevant to ecosystem-based climate-mitigation planning. This study aimed to map mangrove distribution and estimate above-ground biomass carbon (AGC) and sediment organic carbon stock in the 0–30 cm profile along the Banyuasin Coast, South Sumatra, using the Google Earth Engine (GEE) platform. The analysis used Sentinel-2 MSI Level-2A imagery acquired from January 1, 2022, to December 31, 2023, together with soil organic carbon (SOC) data. Mangrove cover was classified using the Random Forest algorithm, while vegetation condition was characterized using NDVI, IRECI, and TRVI. Diameter at breast height (DBH) measurements, sediment sampling, and field ground-check points were used to support carbon estimation and classification evaluation. The classification identified 4,068 ha of mangroves, with an overall accuracy of 86.67% and a kappa coefficient of 0.70. Above-ground biomass carbon ranged from 54.3 to 246.0 Mg C ha⁻¹, totaling approximately 463,600 Mg C. Sediment organic carbon stock in the 0–30 cm profile was dominated by values between 29.0 and 39.0 Mg C ha⁻¹, totaling approximately 144,500 Mg C. The combined above-ground biomass carbon and sediment organic carbon stock in the 0–30 cm profile was approximately 608,100 Mg C. This value is a partial estimate because it excludes below-ground biomass (root carbon), dead wood, litter, and sediment carbon stored below 30 cm. The study provides preliminary spatial information on mangrove carbon stock distribution that may support conservation, restoration, and ecosystem-based climate mitigation planning.]]>
