Global warming is one of the world's issues today. Global warming is a result of the greenhouse effect because it absorbs infrared light reflected by the earth from the sun. CO 2 gas contributes the most to the greenhouse effect. The solution to the problem of global warming is the presence of forests. One type of forest ecosystem is the mangrove forest ecosystem. This study aims to determine the carbon storage of mangrove stands found on Pannikiang Island in the northern part of Barru Regency, South Sulawesi Province. Biomass measurement uses the allometric method performed on mangrove stems by measuring stem diameter in a circle-shaped sample plot of 12.62 m. The results showed that there were ten species found in the study locations: Avicennia alba, Avicennia marina, Bruguiera gymnorrhiza, Bruguiera sexangula, Ceriops decandra, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stilosa, Scyphiphora hydrophyllaceae, and Soneratia alba. The total value of the total stem carbon deposits in the mangrove stands on Pannikiang Island in the northern part of Barru Regency reached a total carbon stem portion of 640,512 tons with a maximum range of 859,174 tons and a minimum of 421,871 tons.