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A wetland is a land area that is saturated with water, either permanently or seasonally, such that it takes on the characteristics of a distinct ecosystem.

There are 19 different types of wetlands in India. It includes mangroves, high-altitude lakes, marshes and ponds. Wetlands cover an estimate of 3 percent of India's land area. 

Wetlands occur naturally on every continent except Antarctica, the largest including the Amazon River basin, the West Siberian Plain,and the Pantanal in South America