ABSTRACT This study was conducted in July-August 2020 by using sediment samples and macrozoobenthos in the southern part of Bengkalis Island, Riau Province. The aim of this study is to find out how much the organic matter content, the abudance of macrozoobenthos, and correlation between the organic matter content of the sediments to the abudance of makrozoobenthos. This study used a survey…