These include Weedy Pond , and to a lesser extent, Towra Lagoon . It often remains dry for long periods but fills after heavy rain. Weedy Pond is also surrounded by a pocket of littoral rainforest Towra Lagoon is the largest fresh water wetland in the Reserve and once supported three species of dabbling duck and the endangered green and golden bell frog. However, due to saltwater incursions from Botany Bay, these birds are rarely seen in the lagoon. The waters around Towra Point support meadows of seagrasses.
Seagrasses grow below the low tide level in the sheltered shallow waters of estuaries.
They are flowering plants and generally prefer soft sediments like sand or mud. Like any plant, seagrasses need light to grow and are often restricted to the upper two metres of water where there is sufficient light. Seagrasses are important habitat for small aquatic animals, provide feeding and nursery grounds for fish and give shelter to juvenile and small adult fish and invertebrates such as prawns and crabs. Seagrasses also play a role in nutrient cycling in Botany Bay by providing nutrients in the form of detritus. Another plant community found at Towra is the Swamp Oak forest which is characterised by tall Casuarina glauca trees as well as a species of Melaleuca ericifolia .