Prison Island Tour – History, Giant Tortoises & Snorkeling Adventure
The Prison Island Tour is one of the most popular and rewarding excursions in Zanzibar, offering a perfect combination of history, nature, and ocean adventure. Located just 5–6 kilometers from Stone Town, Prison Island—also known as Changuu Island—is a small, beautiful island surrounded by crystal-clear turquoise waters of the Indian Ocean.
This half-day Prison Island Tour or full-day tour is ideal for travelers who want to explore Zanzibar’s historical heritage while enjoying snorkeling, swimming, and up-close encounters with giant tortoises.
Historical Background of Prison Island
Despite its name, Prison Island was never actually used as a functioning prison for long periods. In the late 19th century, the island was purchased by the British colonial authorities with the intention of building a prison. However, it was later used as a quarantine station for people arriving in Zanzibar to prevent the spread of diseases such as yellow fever.
During your guided tour, you will explore the old prison building, which still stands today as a historical landmark. Your guide will share detailed stories about Zanzibar’s colonial past and the island’s role in maritime trade and regional history.
The architecture of the prison ruins offers great photo opportunities, especially with the ocean as a stunning backdrop.
Meet the Giant Aldabra Tortoises
One of the main highlights of the Prison Island Tour is visiting the sanctuary of giant tortoises. These impressive creatures were originally gifted to Zanzibar in the late 19th century from the Seychelles. Some of the tortoises are over 100 years old and weigh more than 200 kilograms.
Visitors have the opportunity to:
• See and photograph the giant tortoises
• Learn about their conservation and protection
• Observe their feeding habits
• Get close for memorable experiences
The sanctuary plays an important role in protecting these rare species and educating visitors about wildlife conservation efforts.
Snorkeling & Swimming in Crystal-Clear Waters
After exploring the historical ruins and tortoise sanctuary, you can enjoy snorkeling in the warm, clear waters surrounding the island. The coral reefs near Prison Island are home to a variety of colorful fish and marine life.
Snorkeling activities include:
• Swimming in shallow turquoise waters
• Exploring coral formations
• Spotting tropical fish
• Relaxing on the white sandy beach
Snorkeling equipment is typically provided, and the calm waters make it suitable for both beginners and experienced swimmers.
The island’s clean sandy beaches also offer a peaceful place to relax, sunbathe, or simply enjoy the ocean breeze.
Scenic Boat Ride from Stone Town
Your Prison Island adventure begins with a traditional wooden dhow boat ride from Stone Town. The journey takes approximately 20–30 minutes and provides beautiful views of the Zanzibar coastline.
The boat ride itself is part of the experience, offering great photo opportunities of the ocean, Stone Town skyline, and traditional fishing boats. On clear days, the turquoise waters create a breathtaking setting.
Flexible Tour Options
The Prison Island Tour can be arranged as:
- A half-day excursion (3–4 hours)
• A full-day tour combined with Stone Town exploration
• A private guided experience
• A group tour option
It can also be combined with other Zanzibar activities such as:
• Nakupenda Sandbank picnic
• Spice farm tour
• Jozani Forest visit
• Sunset dhow cruise
This flexibility makes it easy to include Prison Island in your Zanzibar holiday itinerary.
Why Choose the Prison Island Tour?
- Rich historical significance
• Close encounter with giant tortoises
• Excellent snorkeling opportunities
• Short and scenic boat ride
• Ideal for couples, families, and groups
• Perfect half-day escape from Stone Town
Best Time to Visit
Prison Island can be visited year-round. The best months for clear water and optimal snorkeling conditions are:
- June to October
• January to February
Morning departures are recommended for calmer waters and fewer crowds.
What to Bring
- Swimwear
• Towel
• Sunscreen
• Sunglasses and hat
• Camera
• Waterproof bag for valuables
A Must-Do Zanzibar Experience
The Prison Island Tour offers a well-balanced mix of history, wildlife, and relaxation. Whether you are exploring colonial ruins, interacting with giant tortoises, snorkeling in turquoise waters, or enjoying a scenic dhow ride from Stone Town, this excursion delivers unforgettable memories.
It is one of Zanzibar’s most accessible and enriching day trips—perfect for adding culture and adventure to your island holiday.
