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Tamil Nadu Wetlands Mission

Vaduvur Bird Sanctuary

Vaduvur bird sanctuary spreads over an area of 112.638 ha, is a large human-made irrigation tank. It is situated in Needamangalam taluk, Thiruvarur district with part of the Cauvery delta and hence dependent on the release of water from Mettur dam. It is surrounded by a large bund on the southern side and a short bund on the northern side, as the elevation serves as a natural bund. Bunds help in holding the water up to a depth of 2.5 m. Four outlets and discharge canals are present. Potable groundwater is available at a depth of about 20-50m. Being a freshwater habitat, no seasonal fluctuation in salinity is observed. Interconnected by an ancient network of canals, and fed by the Mettur dam. Agriculture is undertaken around and the wetland and ground water used for irrigation. The wetland plays the primary role of buffering by acting as a sponge during events of floods and extreme rainfall. It is a major source of ground water recharge. There is significant runoff from the surrounding catchment and the wetland acts as a sink for sediments.

Salient Features


Criterion 2: supports threatened species such as spot-billed pelican (nt), painted stork (nt) , black-headed ibis (nt) and oriental darter breed (nt).
Criterion 3: supports plants (56), butterflies (55), odonates (8), fish (7), amphibians (5), reptiles (12), birds (170) and mammals (8) maintaining the biological diversity of the bio geographical region.
Criterion 4: supports bird species like oriental darter (nt), black headed ibis (nt), great cormorant (lc) and greater egret (lc) at critical stage of their life cycle.
Criterion 5: supports more than 20,000 water birds which includes both resident and migratory birds such as ibises, egrets, herons, storks, pelican, ducks, cormorants, small waders and other water birds.
Criterion 6: supports 1% population of black headed ibis (nt).



Site NameVaduvur Bird Sanctuary
Site No2493
Declaration Date13.08.2022
Designated Date08.04.2022
Area Exrent ( Hectare)96.89
Elevation ( meters)30 to 70
Depth (m) 1 to 3
Rainfall (mm) 350 to 900
Salinity (ppt) < 0.5
Wetland Type Fresh water lake
Soil Organic
Water pH 7.5
Water TDS ppm 2060
Water Conductivity μS/cm 405

RAMSAR Certificate