Also Nepal, Pakistan, Afghanistan, Bhutan, Sri Lanka, Bangladesh, Maldives Nalbana bird sanctuary at Chilika Lake in India's eastern state of Orissa is one of its major attractions. It is one of the biggest waterfowl habitats measuring 15.63 sq km. The migratory birds arrive in the lake, the biggest brackish water lagoon of Asia, every winter from far off Siberia, Iran, Iraq and Central Europe.