A study was conducted in Periya-kalapuva, Palakuda, Potuvil lagoon wetland system and immediate surrounding area in the coastal zone of Ampara disttrict in order to document the biodiversity profile (basic structure, composition and functions) of the area for facilitating resuorce management. The results showed the presence of biologically diverse habitats in many different aquatic and terrestrial systems. This biological diversity has resulted in the diversity of landscapes, climatic conditions and human impacts. The key ecosystem types recorded there include Forest related ecosystems: Tropical dry mixed evergreen forests (highly fragmented), Tropical thorn frosts (highly fragmented), Riverine forests, Grasslands; Coastal and marine ecosystems; Mangroves,Sand dunes and beaches, Lagoons; Agricultural ecosystems: Paddy lands, Small crop holdings,Coconut plantations and Home gardens.