The Everglades is a subtropical marsh region up to 50 miles (80 km) wide but less than 1 foot (0.3 meter) deep. The Everglades occupies a shallow limestone-floored basin and much of it is covered with saw grass, which grows to a height of 4 to 10 feet (1.2 to 3 meters). It covers more than 4,300 square miles (11,100 square km) of southern Florida, U.S.
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