 It was established in November 1999, under the "Wildlife Protection Act of 1972".The sanctuary protects part of the Kolleru Lake wetland, which gained Ramsar Convention for International importance in 2002.Kolleru Bird Sanctuary covers mainly two districts of Andhra Pradesh they are Krishna and West Godavari districts and between the River Krishna and River Godavari deltas spread over 10 to 25 km from Eluru City.