Prison Island: Changuu Island Guide

What is Prison Island?

Prison Island, officially known as Changuu Island, is a small coral island located approximately 5 km northwest of Stone Town, Zanzibar. The island covers just 0.5 km² and is one of Zanzibar's most popular day-trip destinations. Despite its foreboding name, Prison Island was never actually used as a prison. The name derives from a prison building constructed in 1893 by General Lloyd Mathews, the British First Minister of Zanzibar, intended to house rebellious slaves and later convicts. However, the facility was never used for its original purpose and was instead converted into a quarantine station for yellow fever and bubonic plague cases. Today, Prison Island is a protected reserve and nature sanctuary, famous for its population of giant Aldabra tortoises, some of which are over 190 years old.

Prison Island Attractions & Highlights

Giant Tortoise Sanctuary — The island's star attraction. Over 100 giant Aldabra tortoises roam freely in a dedicated sanctuary. You can walk among them, feed them (under supervision), and take photos with these gentle giants. The oldest tortoise is estimated to be over 190 years old. The Prison Building — The unfinished prison structure is open for exploration. Learn about the island's fascinating history — from intended prison to quarantine station to nature reserve. Snorkeling Reefs — The waters around Prison Island are protected, teeming with colorful coral, tropical fish, and sea turtles. Snorkeling gear is available for rent. Pristine Beaches — The island has two beautiful sandy beaches perfect for swimming. The water is calm, clear, and shallow — ideal for families. Nature Walks — Walking trails circle the small island, offering panoramic views of the Indian Ocean and Stone Town's skyline in the distance.

Unique Features of Prison Island

Prison Island's most unique feature is the giant Aldabra tortoise colony — one of the few places in the world where you can walk among these ancient creatures in a natural island setting. The unfinished prison is a historical curiosity — a building prepared for a purpose it never fulfilled, now standing as a silent monument to a bygone era. The island's dual identity — from intended prison to quarantine station to nature sanctuary — makes its history uniquely layered. The coral reef ecosystem around Changuu is exceptionally well-preserved because of the island's protected status. The proximity to Stone Town (just 30 minutes by boat) means you can be surrounded by giant tortoises and pristine nature within an hour of leaving your hotel, making it one of the most accessible island escapes anywhere in East Africa.

Activities on Prison Island

Tortoise sanctuary visit — Walk among the giant Aldabra tortoises, learn about their history and conservation, and feed them with guidance from the sanctuary keepers. Snorkeling — The coral reefs around the island are rich with marine life. Rent gear on-site or bring your own. The best snorkeling spots are on the eastern side. Swimming — The island's calm, crystal-clear lagoons are perfect for swimming. Historical tour — Explore the old prison building and quarantine station, with informative signage about the island's history. Photography — The island offers fantastic photo opportunities: giant tortoises, historic ruins, turquoise waters, and panoramic ocean views. Beach relaxation — Simply unwind on the white sand beaches, with the sound of waves and the shade of palm trees. Bird watching — The island is home to several seabird species and is a peaceful natural haven.

Prison Island Cost & Pricing

Nearby Attractions

Prison Island is perfectly positioned for combining with other Zanzibar attractions.

• Stone Town — Zanzibar's UNESCO-listed historic quarter is just 5 km away, easily visited before or after your Prison Island trip.
• Nakupenda Beach — A stunning sandbar that emerges at low tide, often combined with Prison Island on half-day boat tours.
• Zanzibar Island — The main island's spice plantations, beach resorts, and cultural attractions are all within easy reach.
• Mnemba Island — A private atoll off the northeast coast offering world-class diving, accessible as a full-day excursion from Stone Town.

How to Book Your Prison Island Excursion

Booking your Prison Island trip with African Majestic Adventure is simple:

• Step 1: Choose your preferred Prison Island package or contact us for a custom itinerary.
• Step 2: Get a detailed quote including boat transfer, entry fees, guide, snorkeling gear, and meals — no hidden costs.
• Step 3: Confirm your booking with a 30% deposit. We handle all reservations and permits.
• Step 4: Receive your pre-travel briefing with departure details and what to bring.
• Step 5: Meet your guide at the Stone Town harbor and set off for your island adventure.

All packages include return boat transfers, entry fees, guide, and snorkeling equipment. Custom itineraries welcome — contact us for a personalized quote.