The Kanwar Lake and Bird Sanctuary is located in Begusarai district, Bhagalpur, in the state of Bihar. The place is well connected by a road network and national highways. It is located at a distance of 132 kms from BHagalpur city.

The Kanwar Lake and Bird Sanctuary is a residual oxbow lake and is said to be Asia's largest freshwater lake. It is formed due to meandering of Gandak river, a tributary of Ganga, in the geological past. It is oxbow lake. It is approximately three times the size of the Bharatpur Sanctuary covering an area of 67. 5 kms. Kanwar lake was declared as a notified area under the Wildlife (Protection) Act of 1972 and to check the poaching of birds it was declared as a protected zone by the Bihar state government in 1986. It was declared as a bird sanctuary by the government of India in 1989. Ornithologist Salim Ali, mentioned about 60 migratory birds that come all the way from Central Asia in winter and recorded around 106 species of resident birds. Some of the critically endangered birds found in the region are Oriental white-backed vulture and the long-billed vulture. Among the vulnerable birds, Greater adjutant, Greater spotted eagle, Lesser kestrel and Sarus crane are found.

People ideally spend 1 to 2 hours at the Kanwar Lake and Bird Sanctuary sighting some rarely found birds. It is suggested to visit the sanctuary during the months of October to June. One must avoid visiting the sanctuary during the rainy season.

One must visit The Kanwar Lake and Bird Sanctuary a haven for migratory birds. It is a must visit for the bird watchers, ornithologists and nature lovers. Photo fanatics must visit this place to click pictures of some rare birds. It is the quietest bird sanctuary in India which makes it an ideal destination for bird watching. The sanctuary remains open on all days of the week and the timings are from 6 AM - 7 PM. There is no entry fee.