This study aims to determine the composition and diversity of plankton species in the waters of the Indragiri Hulu Kembar Lakes. The research location is in Kembar Lakes, Kelesa Village, Seberida District, Indragiri Hulu Regency and at the PMIPA Laboratory, Department of Biology Education, Teaching and Education Faculty, Riau University in October 2022. The method used is a survey by taking fou…