Abstract This research was conducted on July 2019 in the mangrove forest Rawa Mekar Jaya Village, Sungai Apit Sub-district, Siak Regency, Riau Province. This research aims to determine the type of mangrove, type of gastropod and determine the relationship of mangrove density with gastropod abundance in Rawa Mekar Jaya Village. The results of the research found 7 types of mangroves: Rhizopor…