World’s Largest Natural Sewage Treatment Ecosystem of the East Kolkata Wetlands
Kolkata Has World’s Largest Natural Sewage Treatment System, Thanks To One Man’s Lifelong Struggle. Comprising diverse flora, fauna and microbes - which naturally filters the sewage water. More interestingly, the wetlands have been developed and maintained by humans - mostly the local fishermen and farmers, around 30,000 in number.
