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islet in the South Atlantic Ocean. One of the world's most isolated islands, it lies about 1,500 miles (2,400 km) southwest of the Cape of Good Hope of southern Africa and about 1,000 miles (1,600 km) north of the mainland of Antarctica. Of volcanic origin, it is rocky and almost entirely ice-covered, with ice cliffs surrounding the coast. Landing is extremely difficult on the island. It has an area of 23 square miles (59 square km), rises to 3,068 feet (935 metres), and is uninhabited.