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Swamps, bogs and marshes cover 118,000 square miles in the U.S., an area larger than the state of Arizona. More than half of the wetlands the U.S. originally held have been lost due to farming and development, even though wetlands have one of the highest stores of soil carbon in the Earth’s biosphere. The best known wetland in the U.S. is the Florida Everglades. Despite its vast expanse, the Everglades is only 50 percent of its original size—much has been drained for development. Other famous wetlands include the Okavango Delta in Botswana, the Mekong Delta in Vietnam and the Pantanal, an area of Bolivia, Brazil and Paraguay which covers an area larger than England.