Spread over the Puri, Khurda, and Ganjam districts, Chilika lake is a brackish water lagoon of Odisha state on the east coast of India, at the mouth of the Daya river. Covering an area of over 1100 square kilometers it is flowing into the Bay of Bengal. After Vembanad lake, it is the biggest lake. In India, after the new Caledonian barrier reef, Chilika lake is the largest lagoon and the largest brackish water lagoon in the world. As a tentative UNESCO World Heritage site, it has been also enlisted. In India, it is also the largest salt water. For migratory birds on the Indian subcontinent, it is the largest wintering ground. To a number of threatened species of plants and animals, this lake is like a home.