Abstract Mangrove serve as habitat for mangrove snail, including Cerithidea quadrata. A research aims to understand the relationship between mangrove density and the abundance of mangrove snails (C. quadrata) has been conducted from May to July 2020 in the Sungai Asam Village, Indragiri Hilir Regency. A purposive sampling method was applied. There were 3 observation stations, and in each s…