Botswana's Okavango Delta, where the Okavango Rivers empties into the arid Kalahari Desert, is the world's largest freshwater marsh ecosystem. It stretches about 15,000 square kilometers (5,800 square miles).

Photograph by Lorenzo Manni, MyShot
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marsh
marsh Encyclopedic Entry

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A marsh is a wetland, an area of land where water covers ground for long periods of time