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Pond in the Big Cypress National Preserve The geography and ecology of the Everglades are areas of study of the vast interconnected ecosystems known as the Everglades that once occupied about a third of the southern Florida peninsula. Although sawgrass and sloughs are the enduring geographical icons of the Everglades, other ecosystems are as vital, and the borders marking them are subtle or nonexistent. Pinelands and tropical hardwood hammocks are common; the trees, rooted in soil inches abov...