The East Kolkata Wetlands (EKW), located on the eastern fringes of Kolkata city, nurtures the world’s largest wastewater fed aquaculture system. Sewerage that is sent to the wetlands are subjected to solar purification followed by natural oxidation by which the water become conducive for algal and plankton growth which are the primary feed of fishes.
The East Kolkata Wetlands (Conservation and Management) Act, 2006 paved the way for the establishment of the East Kolkata Wetlands Management Authority (EKWMA) for conservation and management of the EKW. The goods and services provided by the EKW include, in addition to fisheries, a very cheap, efficient and eco-friendly system of solid waste and sewer treatment system for the city of Kolkata, habitat for waterfowl and home for a large number of flora & fauna. In 2002, the EKW was included in the Ramsar list of ‘Wetlands of International Importance’.