This research was conducted in January-February 2024 in Concong Dalam Village, Concong District, Indragiri Hilir Regency, Riau Province. This study aims to determine the total sediment organic matter content, types of Uca spp. crabs, abundance of Uca spp. crabs, and the relationship between total sediment organic matter content and abundance of Uca spp. crabs. The method used in this research i…