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According to Wikipedia, "Upland forests include hardwood hammocks and pinelands which provide dry ground for panthers to rest and have higher prey density than lower habitats that are prone to flooding." The Upland is one of three habitats in the Everglades. The habitat type is determined by elevation. Only a few feet separate the highest (upland) from the mid (savanna) and at the lowest level, the subtropical wetland.
The sawgrass prairie is the middle level (by elevation) of the three environments in the Everglades. It extends from Lake Okechobee in the north, down to the southern tip of Florida. Most of the year this area is really a sawgrass marsh. Only during the middle of the dry season (which extends from November through April,) is the ground dry enough to walk on. Sawgrass (Cladium jamaicensis) has small sharp teeth, similar to saw teeth, and can produce lots of little paper cuts if you're not careful.
Just slightly lower in elevation than the sawgrass prairie/marsh, at or just above sea level, the wetland areas of the Everglades host a wide variety of cypress and other swamp dwellers, transitioning to mangrove trees as the water from Lake Okeechobee becomes progressively more brackish, approaching the mud banks of Florida Bay.