Kuantan Singingi Regency (Kuansing) is one of the districts crossed by two major rivers, namely the Batang Kuantan River and the Singingi River with a river flow area of 22,672 km². This study aims to analyze the impact of Unlicensed Gold Mining (PETI) activities on the diversity of macrozoobentos in the Batang Kuantan River, Kuantan Singingi Regency. Two observation stations were selected, ea…