The Park has predominantly saltmarsh vegetation including Shrubby Glasswort and Beaded Glasswort, which provide food for the rare Orange-bellied Parrot.
The IBA includes the undeveloped coast between Williamstown and Seaholme, including the Jawbone Reserve, Altona Coastal Park, Rowden's Swamp, the Cheetham Wetlands, Truganina Swamp, with the Spectacle Lakes complex and RAAF Lake of Point Cook Coastal Park.
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