For much of the 20th century, robben island in south africa was most known as

A place for imprisonment.    

Explanation:

Robben Island was not a pleasure resort but served the purpose of imprisonment, isolation, and banishment for several centuries. In the 20th century, the island used as a prison for political prisoners of South Africa during the Apartheid government. One of the famous African person inmates held here was   Nelson Mandela, who became future South African President.      

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