Plankton are creatures (plants and animals) whose lives float or float in water that is washed away by currents. This study aims to determine the diversity of plankton in the Kampar river, Kuala Terusan Village. This research was conducted in August-September 2023. Plankton sampling uses the filtering method with plankton net. Sampling was carried out at 3 observation stations with 3 sampli…