Island situated in Table Bay, 7 kilometres off the coast of Cape Town, measuring approximately 3.3 kilometres long and 1.9 kilometres wide. Has predominantly been used as a place of banishment and imprisonment, particularly for political prisoners, since Dutch settlement in the seventeenth century. Three men who later became South African presidents have been imprisoned there: Nelson Mandela (1964–1982), Kgalema Motlanthe (1977–1987) and Jacob Zuma (1963–1973). Now a World Heritage Site and museum.