Description St. Marks National Wildlife Refuge is one of the oldest wildlife refuges in the United States. Established in 1931 as a wintering ground for migratory birds, it encompasses 68,000 acres (280 km) spread between Wakulla, Jefferson, and Taylor Counties in the state of Florida. The refuge includes several Gulf of Mexico coastal habitats, such as saltwater marshes, islands, tidal creeks, and the estuaries of seven north Florida rivers. It is home to a diverse range of plant and animal life and also has a long history of human use, including structures such as the St. Marks Lighthouse, the second oldest lighthouse in Florida. The refuge is a 'gateway site' for the Great Florida Birding Trail.