The Karaivetti Bird Sanctuary is a 4.537-square-kilometre (1.752 sq mi) protected area located in the Ariyalur District of the state of Tamil Nadu, India. The sanctuary is about 25 kilometres (16 mi) from Thanjavur. This freshwater lake is fed by Pullambadi, Kattalal canal and attracts thousands of birds every year. This lake was declared as a sanctuary in 1999 by the Government of Tamil Nadu. About 200 birds are species recorded from this sanctuary. Karaivetti Bird Sanctuary is one of the Important Bird Areas (IBA's) of Tamil Nadu (Code No. IN268, Criteria: A1, A4i, A4iii).