UNESCO declared Robben Island in the Western Cape a World Heritage Site in 1999. Robben Island is located in Table Bay, some  west of Bloubergstrand in Cape Town, and stands some 30m above sea level. Robben Island has been used as a prison where people were isolated, banished, and exiled for nearly 400 years. It was also used as a leper colony, a post office, a grazing ground, a mental hospital, and an outpost.