Heading southward, the route passes through the busy city of Wilmington, North Carolina, and takes another ferry ride into Southport, North Carolina. Next come farmlands, swamps and the Francis Marion National Forest. There is an optional spur into historic Charleston, South Carolina. There are more farms and swamps in Georgia. Another optional spur takes riders into Savannah, Georgia, with one of the largest national historic landmark districts in the United States. Okefenokee National Wildlife Refuge is four miles off route. It is one of the largest and most primitive swamps remaining in the United States. Riders can see numerous alligators of all sizes, stroll on boardwalks over the marshes, or take a boat ride through the swamp.