Prison Island also known as the Changuu Island lies about 30 minutes by boat from the Zanzibar Island. The prison thereon was never used to house prisoners. The Prison Island Tour in Zanzibar will take you there. The island was once used by an Arab slave trader to contain the more troublesome slaves he had brought from the African mainland to prevent their escape before shipping them to the Arabian purchasers, or for auctioning in Zanzibar slave trade market. The slaves were dumped on the island.
