Changuu Island lies 5.6 kilometres northwest of Stone Town, reachable only by traditional dhow or motorized ngalawa. Sultan Barghash purchased the island in 1893 intending to build a detention facility for rebellious subjects, but the prison never held a single prisoner.
British authorities converted the limestone structures into a quarantine station during the 1923 cholera outbreak, processing merchant sailors bound for the Swahili Coast trade routes. Today four Aldabra giant tortoises imported from Seychelles in 1919 remain, descendants of a gift intended to populate the island's scrubland with exotic fauna.
Boat tour Zanzibar departures concentrate along Forodhani Gardens and Mizingani Road, where captains negotiate passage for groups of six to twelve. The journey crosses Zanzibar Channel's tidal flats, passing rusted cargo dhows anchored in shallows too shallow for modern vessels. Nakupenda Sandbank emerges at low tide three kilometres west of Changuu, a crescent of white coral sand hosting seasonal seafood vendors and snorkel equipment rentals. Mnemba Atoll's protected reef system lies sixteen kilometres north, encircling a private island where bottlenose dolphins feed along the drop-off between November and March.
Conservation entry to Changuu costs 4 USD per visitor, collected at the island's stone pier and allocated to tortoise husbandry programs overseen by the Zanzibar Wildlife Conservation Society. The facility operates daily from 09:00 to 16:15, though afternoon departures from Stone Town risk missing the return crossing before sunset. Marine park regulations prohibit anchoring within fifty metres of coral formations and feeding wildlife without ranger supervision. Dhow operators licensed through the Zanzibar Association of Tourism Investors maintain wooden vessels according to 2019 maritime safety standards, equipping each boat with life vests, VHF radios, and first-aid supplies for offshore excursions beyond the harbour breakwater.
9 hr
