The Karaivetti Bird Sanctuary is a 4.537-square-kilometre (1.752 sq mi) protected area and Ramsar site, located in the Ariyalur District of the state of Tamil Nadu, India.

[7][4] The sanctuary is a large irrigation tank located in the northern alluvial plains of the Kaveri river.

Acacia nilotica planted inside the lake is serving as a major nesting site for birds.

[5] Globally threatened species such as Greater Spotted Eagle, Oriental Darter, Black-headed ibis and Spot-billed Pelican were reported in this site [10][11] Karaivetti is one of the important active heronries in Tamil Nadu.

[8] Spot-billed Pelican, Black-headed ibis, Painted Stork, Oriental Darter, Eurasian Spoonbill are some of the birds species breeding in this sanctuary[12][4] Other fauna inhabit this region are Golden Jackal, Black-naped hare, Indian grey mongoose and nearly 15 species of fish were reported [13] Karaivetti Bird Sanctuary attracts birdwatchers mainly during the winter season.