ABSTRACT Along the river and coastal waters of the Sungai Guntung of Kateman District Indragiri Hilir Regency Riau Province covered with mangroves for reduce swell wind, sea wave, and sea water intrusion. There is potential destruction to mangrove in the Sungai Guntung such as industrial activities and use of mangrove stems for building foundation materials. The purpose of this research is d…