The Everglades is the most famous wetland in the United States and one of the most distinct in the world. It is unique among the world's large wetlands because it derives its water directly from rainfall. Other large and famous wetlands, such as the Pantanal of South American, the Okavango of Botswana, and the Llanos in Venezuela and Colombia, derive most of their water and nutrient inputs from river flooding. The unique "sheet flow," the slow flow of water over shallow, broad tracts of marsh, inspired environmentalist Marjory Stoneham Douglas to name the Everglades the "River of Grass."
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