Changuu Island (also known as Kibandiko, Prison or Quarantine Island) is a small island 5,6 km north-west of Stone Town, Unguja, Zanzibar, The island is around 800m long and 230m wide at its broadest point, The island saw use as a prison for rebellious slaves in 1860s and also functioned as a coral mine, The British First Minister of Zanzibar, Lloyd Mathews, purchased the island in 1893 and constructed a prison complex there, No prisoners were ever housed on the island and instead it became a quarantine station for yellow fever cases, The station was only occupied for around half of the year and the rest of the time it was a popular holiday destination, More recently the island has become a government-owned tourist resort and houses a collection of endangered Aldabra giant tortoises which were originally a gift from the British governor of the Seychelles,