The Everglades - American Wilderness Author:Archie Carr, Time-Life (Editors) The Everglades region of southern Florida includes some 13,000 square miles of wilderness. The terrain is marshy grassland bordered along the southern and western coasts by mangrove swamps. The entire region is low and flat, so drainage is poor. The interior, drenched by 50 to 60 inches of annual rainfall, remains largely under water most ... more »of the year.« less