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On the coast of Langge Village, Anggrek Subdistrict, North Gorontalo Regency, there is a mangrove forest covering an area of approximately 1,441.04 hectares, accounting for 5.29% of the total 27,218.79 hectares. Actinomycetes are heterotrophic bacteria crucial in decomposing mangrove leaf litter into organic matter. These bacteria are capable of oxidizing ammonia or nitrogen into nitrites or nitrates. They also serve as a source of nutrition in the mangrove ecosystem and help maintain the balance of aquatic organisms and marine ecosystems. The results found that the highest number of Actinomycetes bacteria were found in Rhizopora mucronata with a density of 4.1X102 CFU/g on stems, 4.0X10 CFU/gr on roots, and 1.0X10 CFU/gr on the soil. Thus, the higher the IVI value, the greater the amount of leaf litter, and the higher the leaf litter production, the higher the density of decomposing microorganisms, in this case, the Actinomycetes bacteria. In addition, the greater the number of decomposing bacteria, the more stable the mangrove ecosystem becomes. Allah did not create everything in vain, even for the billions of planets in the universe. In the past, humans were only aware of the macroscopic creatures. However, with the development of science and the invention of the microscope, humans began to recognize tiny invisible creatures. This study found several Quranic verses that examine the smallest creatures (microorganisms), such as the word zarrah in Surah Saba' verse 22, and the word dabbah in Surah Al Baqarah verse 164 and Hud verse 6, al Jathiyah verse 4, and Al Anam verse 38 Thus, the Qur'an has indicated the existence of other creatures on earth whose life cannot be seen by the naked eye, yet they provide benefits to other creatures

Mangroves, bacteria; actinomycetes