Heavy metals in the water might be accumulated in the sediments as well in the aquatic organisms such as crab. The purpose of this research is to understand the Pb and Zn content in the water, sediment and in the mangrove crab (Scylla serrata) present in the waters of Kuala Enok estuary. This research was conducted in March 2017. There were 3 stations, in the cruise line (St 1), in the area wit…