The Everglades is a vast subtropical swampland in southern Florida, spanning approximately 4,000 square miles (10,360 square kilometers), a unique ecosystem often dubbed the “River of Grass” for its slow-moving waters and sprawling sawgrass prairies. Stretching from Lake Okeechobee (1,900 square kilometers) at 27°10’N, 80°50’W to Florida Bay at 25°00’N, 81°00’W, this 160-kilometer-long wetland covers a 9,000-square-kilometer watershed within Florida’s 170,312-square-kilometer peninsula. A UNESCO World Heritage Site since 1979 and part of a 7,800-square-kilometer National Park since 1947, it sustains a delicate balance of biodiversity, hydrology, and human history across its 4,000-square-mile expanse.
Geologically, the Everglades formed over 5,000 years as sea levels rose post-Ice Age, flooding a limestone plateau—remnants of a 100-million-year-old coral reef—spanning 10,360 square kilometers. Its 0.5-meter elevation drop over 160 kilometers creates a 60-kilometer-wide sheet flow, averaging 15 centimeters deep, moving 0.8 kilometers daily, per USGS. This flat terrain, dotted with 1,000 square kilometers of tree islands and 2,000 square kilometers of mangroves along its 300-kilometer Gulf coast, rests atop a 1,500-square-kilometer aquifer supplying 8 million Floridians per SFWMD 2023.
Ecologically, the Everglades teems with life. Its 10,360 square kilometers host 350 bird species—roseate spoonbills flock across 1,000 square kilometers—36 threatened species like the Florida panther (100 left), and 60% of U.S. wading birds, per NPS. The 1,500-square-kilometer coastal estuaries nurture 70% of Florida’s fisheries—300,000 tons yearly—while 900 square kilometers of sawgrass filter 1 trillion gallons of water annually. Alligators, numbering 200,000 across 4,000 square miles, regulate this food web, though invasive pythons—10,000 since the 1990s—threaten mammals over 2,000 square kilometers, per FWC.
Hydrologically, it relies on 1,400 mm of annual rain—60% from June’s 2,000-kilometer Atlantic storms—flowing from Lake Okeechobee’s 15-meter rim through a 9,000-square-kilometer basin. Human engineering—2,800 kilometers of canals since 1882—halved its 20,000-square-kilometer historic size, draining 4,000 square miles for sugarcane across 2,800 square kilometers, per Everglades Foundation. A 1.1°C warming since 1880 and 20 cm sea-level rise since 1900 flood its 300-kilometer coast, per NOAA, shrinking 260 square kilometers since 1990.
Historically, the Everglades shaped cultures. The Calusa thrived on its 1,500-square-kilometer estuaries by 1000 BCE, crafting 20-meter shell mounds, while Seminoles retreated to its 4,000-square-mile interior during 19th-century wars across 1,000 kilometers of swamp. European settlers in Florida’s 170,312-square-kilometer south drained 1,000 square miles by 1900, sparking a 1934 preservation push— Marjory Stoneman Douglas’s River of Grass rallied for its 7,800-square-kilometer park.
Economically, it underpins a $100 billion tourism sector—5 million visit its 4,000 square miles yearly—while its 1,500-square-kilometer fisheries yield $1 billion, per NOAA. Restoration, like the 2000 Comprehensive Everglades Restoration Plan (CERP), spans 9,000 square kilometers, costing $23 billion by 2023 to revive 2,000 square miles, per USACE. Culturally, its 10,360-square-kilometer expanse inspires art—from Miami’s 146-square-kilometer galleries—and Miccosukee traditions along its 160-kilometer flow.
Climatically, the Everglades buffers storms—its 1,000-square-kilometer mangroves cut 25% of surge impacts across 300 kilometers—yet, per the IPCC, it faces a 50 cm sea rise by 2100, threatening 4,000 square miles. Its 9,000-square-kilometer watershed, filtering 1 trillion gallons, remains a global marvel, balancing nature and human stakes.