Kolleru Lake (కొల్లేరు సరస్సు) is a 2nd largest freshwater lake located in Andhra Pradesh
. Kolleru is located between Krishna and Godavari delta. Kolleru spans into two districts - Krishna and West Godavari. The lake serves as a natural flood-balancing reservoir for these two rivers. The lake is fed directly by water from the seasonal Budameru and Tammileru streams, and is connected to the Krishna and Godavari systems by over 68 in-flowing drains and channels. This lake is a major tourist attraction.
Rich in flora and fauna, it attracts migratory birds from northern Asia
and Eastern Europe
between the months of October and March. During this season, the lake is visited by an estimated 20,00,000 birds. The resident birds include Grey pelicans, Asian Open-billed Storks (Anastomus oscitans), Painted Storks (Mycteria leucocephala), Glossy Ibises, White Ibises, Teals, Pintails, Shovellers. The migratory birds include Red-Crested Pochards, Blackwinged Stilts, Avocets, Common Red shanks, Wigeons, Gadwalls and Cormorants, Garganys, Herons, Flamingos & among othersThe lake was notified as a wildlife sanctuary in November 1999 under India's Wildlife Protection Act of 1972, and designated a wetland of international importance in November 2002 under the international Ramsar Convention. The wildlife sanctuary covers an area of 308 km sq.
Atapaka: 1.5 km from Kaikaluru to see varieties of waterfowl. Murthyraju tank 8 km from Nidamarru East Chodavaram: 53 km from Eluru
where Open Bill Storks nest in colonies from July – December. The sanctuary is approachable from all four sides of the lake by road, directly to the following places. Atapaka – 2.5 km from Kaikaluru town, Bhujabalapatnam - 6 km from Kaikaluru town, Murthiraju Tanks – 8 km from Nidamarru, Gudivakalanka – 3 km from Gudivakalanka or 15 km from Eluru the reacent president of gudivakalanka is gantasala rambabugaru it is the most beautiful village with customs and traditions.