Pui O is a bay located in southern Lantau Island, shaped by the Chi Ma Wan Peninsula and the lower slopes of Sunset Peak. A main river joins other smaller streams draining into the bay, forming an estuary. Habitats in Pui O are diversified including Fung Shui woodland, marsh, freshwater stream and mangrove. A large piece of wetlands give rise to a great diversity of insects and amphibians, which form a good foraging for migratory and resident birds. At least 180 species of birds has been recorded in Pui O including rare species like Eurasian Hoopoe and Ruddy-breasted crake, etc. However, filling of construction waste and rubbish in farmland and wetland in Pui O is a continuous threat. Although Pui O is zoned as a Coastal Protection Area, it is not covered by Development Permission Area Plan and therefore relevant department does not have power to enforce the law. The government is planning to expand the area of Pui O campsite in association with other tourist development in Southern Lantau. The natural environment of Pui O in the future is in growing peril.