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The purpose of this study was to see the types of mangroves and the different health conditions of mangrove forests in North Lembeh Waters and around the Bitung-LIPI Marine Biota Conservation Workshop. Of the four stations, Rhizoporaapiculata is dominated by plants that grow well in areas where there is a lot of mixed sandy mud sediments and in locations that are protected from strong waves, in the estuary area which is some distance from the offshore. Based on the reference to the Decree of the Minister of Environment No. 201 in 2004, all research stations on North Lembeh Island are in good condition. The station which has a sandy and muddy substrate (LMBEM02 and LMBEM04) is dominated by Rhizoporaapiculata while the station (LMBEM 01) is dominated by AegicerasFloridum species that live on coral substrate. The increasing density of mangroves at four stations (LMBEM01), (LMBEM02), (LMBEM03), and (LMBEM04), namely from the results of research, each number of mangroves in station at station one (LMBEM01), totaling 84 stems, station two (LMBEM02) ), totaling 123 stems, station three (LMBEM03), totaling 86, and at station four (LMBEM04), there are 95 stems from the results of research on the island of Lembeh Selatan at LMBEM01 station which has the highest density value with a density value of 2500 per hectare. While the lowest density is at LMBEM04 station with a tree density value of 1500 per hectare. The decrease in the number of mangroves on North Lembeh Island when the research was carried out could be caused by the construction of fishing boat docks and community activities on North Lembeh Island which is located in Mawali.