The state of Florida is best known for its beaches and swaying palm trees. But a good chunk of it is swampland. The famous Everglades, a slow-moving sheet of water full of plants and alligators, cover much of the southern part of the state.

To the north, the Okefenokee, which is partly in Florida and mostly in neighboring Georgia, is a true swamp, with its own gators and snakes and even beautiful orchids.

The Okefenokee seems primeval. It was formed when waters from an ancient ocean receded and a mammoth sandbar blocked most of the water flow to the sea. Left behind was an 1,800-square-kilometer swamp.

There's no big city within 200 km, but tourists from all over the world manage to find it. They all want to know about its unusual name. Okefenokee is a Miccosukee Indian word meaning land of trembling earth. Way back in the swamp are small, floating islands, called hammocks, that one can walk across. And they tremble. Standing on them is like trying to balance on a floating mattress.

Better to avoid the unstable hammocks altogether, since they're filled with snakes, occasional bears, and flesh-eating plants that, helpfully, feed on mosquitoes.

Water in the Okefenokee is dark, like tea that has steeped a long time. The color comes from tannin that seeps from towering cypress trees draped in Spanish moss.

Every once in awhile, the rangers must crack down on reckless pilots of air boats that skim across the swamp, endangering themselves and others and tearing up delicate foliage. And developers, logging companies, and strip-mine operators on the edge of the swamp can easily upset the delicate balance of nature in the area.

The Okefenokee, which is already nearly choked with plants, would probably fill in, dry up, and become just another cypress and pine forest were it not for range fires that come along every once in awhile and burn out decayed vegetation. So the water in this protected National Wildlife Refuge keeps moving - slowly, very slowly.

gator: =alligator a large reptile of the crocodile family, with a long tail, hard skin and very big jaws, that lives in rivers and lakes in America and China 钝吻鳄（见于美洲和中国的江河湖泊中）

primeval: from the earliest period of the history of the world, very ancient 远古的；原始的

tannin: a yellowish or brownish substance found in the bark of some trees and the fruit of many plants, used especially in making leather, ink and wine 单宁；单宁酸；鞣质

ranger: a person whose job is to take care of a park, a forest or an area of countryside 园林管理员；护林人

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（来源：VOA 编辑：陈丹妮）