This research was conducted on February 2009 in the waters of river Ungar. Method used Transek Lines and survey methods. Observation of mangrove in the area, found 20 species of 12 families, which were : Acrostichum aureum, Aegiceras floridum, Avicennia alba, A. eucalyptifolia, A. marina, A. officinalis, Ceriops decandra, C. tagal, Derris trifoliata, Excoecaria agallocha, E. spp, Lumnitzera lit…