ABSTRACT This research was conducted in February 2021 in the Mangrove Tourism Area of Sungai Bersejarah, Kayu Ara Permai Village, Sungai Apit District, Siak Regency, Riau Province. This study aims to determine the amount of production and decomposition rate of mangrove litter, to determine differences in litter production and decomposition rates between transects, and to determine the relation…