Cumberland Island National Seashore preserves most of Cumberland Island in Camden County
, the largest of Georgia's Golden Isles. The seashore features beaches and dunes, marshes, and freshwater lakes. In addition to the natural features, the seashore includes some historic properties, such as the ruins of Dungeness and the Plum Orchard estate.
The island is only accessible by boat. The visitor center and boat access to the island are located in the town of St. Marys, Georgia. Public access via the ferry is limited, reservations are recommended. Camping is allowed in the seashore. The 9,886-acre (40.01 km2) Cumberland Island Wilderness is part of the seashore.The Cumberland Island National Seashore Museum is located in St. Marys, Georgia on the mainland entrance to the seashore, across from the park's visitor center.