Spend a day on Prison Island (Changuu) swimming clear reef waters and meeting ancient Aldabra tortoises. This full-day trip from Stone Town mixes shallow snorkeling, local history, and relaxed beach time.
More ways to explore the area's outdoor wonders
A short wooden dhow slices through the Indian Ocean and the shoreline of Stone Town recedes into a band of rust-red roofs and minarets. On the horizon, Prison Island—Changuu—rises as a low, coral-limestone rim crowned by palms and the slow silhouettes of giant tortoises grazing in the shade.
Difficulty
moderate
Duration
8 hours
Fitness Level
Moderate fitness; able to climb in/out of small boats, swim short distances, and walk on uneven sandy/coral terrain.
Wildlife
History
Prison Island (Changuu) was used in the 19th century as a quarantine station and later as a prison; its coral stone buildings reflect colonial-era maritime control and public-health responses.
Conservation
Local programs focus on Aldabra tortoise breeding and protecting reef habitat—visitors are asked to avoid feeding wildlife and use reef-safe products.
Reserve your spot on the Prison Island Snorkeling and Tortoise Encounter in Zanzibar today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Bring reef‑safe sunscreen
Coral reefs around Prison Island are sensitive—use reef‑safe SPF and reapply after swimming.
Pack a lightweight snorkel set
Equipment is provided, but a personal mask improves comfort and prevents fogging during longer swims.
Wear sturdy water shoes
The beach and walking paths include coral rubble and uneven surfaces—protect your feet when getting in and out of the boat.
Book morning departures
Calmer seas and clearer water for snorkeling typically occur mid‑morning before winds pick up in the afternoon.
Reef‑safe sunscreen
Protects skin and minimizes damage to corals during snorkeling.
summer
Personal mask (anti‑fog)
Improves fit and visibility compared with shared rental masks.
Water shoes
Protects feet on coral sand and when boarding small boats.
Dry bag (small)
Keeps phone, camera, and documents dry while on the boat or in shallow water.