The main purpose of study was to find out characteristics of sediment and velocity of coastline change in Sungai Kayu Ara Village which is located off the Siak district, Riau. Sediment samples were collected at 3 stations in coastal area of Meskom Village in September 2019. Stations 1 and 2 are located in the residential area and Station 3 is in the vicinity of the Ara Permai Mangrove Tour…