What is the name of the 'infamous prison where nelson spent most of his captivity and for how long was he in prison there?

Nelson Mandela spent most of his captivity at Robben Island, a notorious prison off the coast of Cape Town, South Africa. He was imprisoned there for 18 years, from 1964 until 1982, before being transferred to other facilities. Robben Island became a symbol of the struggle against apartheid and Mandela's enduring legacy.