If you’re planning a Zanzibar holiday and craving a mix of wildlife wonders, rich history, and turquoise paradise, Prison Island Zanzibar (also known as Changuu Island) should be at the top of your list. Just a short boat ride from the UNESCO-listed Stone Town, this tiny island packs a punch: ancient giant tortoises that predate your grandparents, crumbling colonial ruins, pristine beaches, and world-class snorkeling.
At Primate Holidays, we specialize in unforgettable East African adventures – from gorilla trekking in Uganda and Rwanda to chimpanzee safaris in Tanzania. But our Zanzibar extensions? They’re the perfect way to unwind after the thrill of the primates. And Prison Island is the ultimate highlight.
Ready to learn why thousands of travelers call this their favorite Zanzibar day trip? Let’s dive in.
The Captivating History of Prison Island: From Slave Holding to Sanctuary
Don’t let the name fool you – Prison Island Zanzibar was never a real prison for criminals. Its story is far more intriguing.
In the 1860s, during the height of the East African slave trade, the island (then called Changuu) was used by Arab slave traders as a holding pen for rebellious enslaved people before they were shipped across the Indian Ocean. Later, in 1893, the British colonial government built a maximum-security prison here. But the facility was never used for its intended purpose.
Instead, it became a quarantine station for ships carrying yellow fever and other diseases earning it the nickname “Quarantine Island” or Kibandiko. Today, the haunting stone ruins stand as a silent witness to Zanzibar’s complex past, offering a powerful glimpse into the island’s layered history of trade, colonialism, and resilience.
As you wander the overgrown paths with your local guide, you’ll feel the weight of centuries. It’s history you can touch and a story you’ll never forget.
Meet the Real Stars: Aldabra Giant Tortoises on Prison Island
The moment you step onto the island, you’ll hear it – the slow, deliberate crunch of massive shells on the sand. Prison Island is home to one of the largest colonies of Aldabra giant tortoises in the world.
These gentle giants were gifted to Zanzibar from the Seychelles in 1919. Some are over 150 years old and weigh up to 250kg (that’s heavier than a grand piano!). With their wise, ancient eyes and slow-motion swagger, they feel like living dinosaurs.
On our guided tours, you can:
- Feed them fresh greens (provided by the sanctuary)
- Get up close for photos (they love a good selfie!)
- Learn about conservation efforts to protect these endangered reptiles
Kids adore them. Adults are mesmerized. And yes, they’re completely safe and friendly.
Beyond the Tortoises: Snorkeling, Beaches & Hidden Gems
Cheetah’s Rock tailors experiences for every traveler, ensuring small groups (for intimacy and safety) and expert guides who share conservation insights. Here’s what you can expect:
Prison Island isn’t just about history and tortoises. It’s a full-day tropical escape.
- World-Class Snorkeling: The surrounding coral reefs teem with colorful fish, sea turtles, and even the occasional reef shark. Gear is provided on Primate Holidays tours.
- Pristine Beaches: Soft white sand, swaying palms, and calm, shallow waters perfect for swimming.
- Peacocks & Birdlife: Wild peacocks strut around the island, adding a splash of color to your photos.
- Stunning Views: Look back toward Stone Town – the skyline against the Indian Ocean is pure magic.
Many of our guests combine this with a visit to Nakupenda Sandbank (a pure-white sandbar that appears at low tide) for the ultimate Zanzibar day trip.
How to Visit Prison Island Zanzibar: Easy & Hassle-Free
Getting to Prison Island is part of the fun.
- Location: Just 5.6 km (20–30 minutes by traditional dhow) from Stone Town.
- Best Tours: Half-day or full-day excursions from Stone Town or your Zanzibar beach hotel.
- What’s Included in Primate Holidays Tours:
- Private or small-group boat transfer
- Expert English-speaking guide
- Entrance fees & tortoise feeding
- Snorkeling equipment
- Soft drinks & snacks
Best Time to Visit Prison Island in 2026 + Expert Tips
Best months: June to October (cool, dry, perfect weather) and December to February (warm, sunny, great for snorkeling).
Avoid: April-May (long rains) and November (short rains) when seas can be choppy.
Pro Tips from Our Guides:
- Wear reef-safe sunscreen and bring a hat, the sun is strong!
- Pack your camera, swimsuit, and cash for souvenirs.
- Respect the tortoises: No touching shells or feeding human food.
- Combine with a Stone Town walking tour for the perfect day.
Why Book Your Prison Island Tour with Primate Holidays?
We’re not just another tour operator. We’re East Africa’s primate and wildlife specialists and we bring that same passion to every Zanzibar adventure.
Ready to Meet Zanzibar’s Ancient Giants?
Don’t just dream about Prison Island Zanzibar - make it happen.
Whether you’re extending your primate safari or planning a pure beach escape, this is one experience you’ll talk about for years.
Dream it, we'll plan it