The purpose of this study was to determine the types and density of gastropods in the seagrass ecosystem in Pengudang Village, Bintan Regency, Riau Islands Province. This study was conducted in September 2024 in the waters of Pengudang Village, Bintan Regency, Riau Islands Province. The method used was a survey method by conducting direct observations and using line transects and 1x1 m2 quadran…