Landscape in the Okefenokee National Wildlife Refuge in Georgia. Credit: Alexander Ließ / Getty Images Set at the headwaters of the Suwannee and St. Marys rivers in southeastern Georgia, the Okefenokee Swamp is not only one of America’s most important ecosystems, but also the largest blackwater swamp in North America. Its vast stretches are home to several endangered species, like the indigo snake and the wood stork. The name comes from the Muscogee word for "land of the trembling earth," which references the movement of the peat beneath the water. The Muscogee people lived in the area before European settlement. Next came the logging industry and an ill-fated attempt to drain the Okefenokee. In 1937, the swamp was declared a wildlife refuge by President Franklin D. Roosevelt, who spent extensive time in Georgia. The Civilian Conservation Corps—including Company 1433, an all-Black unit—was responsible for building most of the facilities you see at the refuge today.…