City’s Pallikaranai marsh is among the 11 wetlands in Tamil Nadu chosen under a five-year National Action Plan for Conservation of Migratory Birds and their Habitats along Central Asia Flyway (2018-2023).

Of the wetlands of ornithological importance identified on the basis of existing monitoring information, 29 sites, including 20 major wetlands and nine wetland clusters, have been identified as significant bottleneck sites for migratory waterbirds in India.

In Tamil Nadu, Point Calimere (Nagapattinam), Great Vedaranyam Swamp (Nagapattinam), Gulf of Mannar Marine National Park and Adam’s Bridge (Ramanathapuram & Thoothukudi districts), Karaivetti Bird Sanctuary (Ariyalur), Pallikaranai (Chennai) are the wetlands prioritised for the conservation of migratory waterbirds. The wetland clusters in Kanniyakumari, including Suchindram, Theroor, Vembanoor and Manakudi Estuary figure in the list, besides salt pans of Puthalam and Kovalam. This is highest for any State in the country.