Periphyton is a microorganism that lives attached to a submerged substrate. This research aims to determine the type and abundance of periphyton in Tepian Batu Lake and was conducted in June-July 2019. There are three sampling station, namely S1 (Inlet water channel connecting Lake Tepian Batu with Kampar Kanan River), S2 (located floating net cages), S3 (there are water plants and close p…