Muthurajawela marshes, north of Colombo in Sri Lanka, are a fine example ofwhat a well-thought-of wetland conservation project should be. Once a tropical wetland used for rice cultivation, they have today become a nursery for coastal fish and are home to some 126 species of birds; they also act as the 'green lung' for Colombo.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/green-lung
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wetlands
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sri-lanka