Cumberland Island is one of the Sea Islands of the southeastern United States and is the largest in terms of continuously exposed land. It is located on the Atlantic Ocean off the coast of the U.S. state of Georgia and is part of Camden County, Georgia (30°51'N, 81°27'W). Cumberland Island constitutes the westernmost point of shoreline on the Atlantic Ocean in the United States. The island is long, with an area of 36,415 acres (147.37 km² or 56.25 square miles), including of marsh, mudflats, and tidal creeks. There is no bridge to the island; most visitors reach the island by the Cumberland Ferry from St. Marys.