This research was conducted in February - March 2024, located in the Estuary of Mengkapan Village, Sungai Apit District, Siak Regency. The purpose of this study was to determine the value of density, biomass, carbon stock and CO₂ uptake, and to determine the relationship between density and biomass, carbon stock and CO₂ uptake of mangroves. The method used is the survey method. At the resea…