What is "changuu"

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.