UNESCO: United Nations Educational, Scientific and Cultural Organization Logo courtesy of UNESCO. Map of geologic subprovinces in south Florida. Geographic data provided by St. Johns River Water Management District;Map courtesy of Trista L. Thornberry-Ehrlich, Colorado State University. The first criterion listed by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in its designation of Everglades National Park as a World Heritage Site in 1979 is: The Everglades is a vast, nearly flat seabed that was submerged at the end of the last Ice Age. Its limestone substrate is one of the most active areas of modern carbonate sedimentation. UNESCO recognized that the subtropical wetlands, coastal and marine ecosystems, and complex biological processes that make the Everglades a sanctuary for its legendary wildlife would not exist were it not for the underlying geology, which predefines existing Everglades landscapes and ecosystems.
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