ABSTRACT Bengkalis Island is a peat island which is prone to beach abrasion. Abrasion happens at the rate of 32,5 m/year, especially on the west of Bengkalis Island. The relatively lightweight characteristic of peat materials makes it more susceptible to beach abrasion and sedimentation. Since peatland beaches are very rare in the world, study about peatland beaches abrasion was also rarel…