Prison Island (Changuu Island): History, Nature & Giant Tortoises
Prison Island, also known as Changuu Island, is one of the most popular excursions in Zanzibar. Located just a short boat ride from Stone Town, this small island offers a perfect combination of history, natural beauty, and wildlife experiences.
Despite its name, Prison Island is not only about prisons — it is a peaceful island escape with fascinating stories and unforgettable attractions.
Why Prison Island is Special
Prison Island has a rich and complex past. It was originally used as a place of detention and later served as a quarantine station during historical disease outbreaks. Today, it has transformed into a relaxing tourist destination famous for its clear waters and giant tortoises.
It is one of the best half-day trips for travelers who want both cultural history and nature in one experience.
What You Will Experience on Prison Island
✓ Meet the Famous Giant Aldabra Tortoises
The main attraction on Prison Island is the population of giant Aldabra tortoises, some of which are over 100 years old.
These tortoises were originally gifted to Zanzibar from the Seychelles and have been protected on the island for decades. Visitors can walk among them, take photos, and learn about their conservation.
This experience is especially enjoyable for families and wildlife lovers.
✓ Explore the Historic Prison Ruins
The island is home to old prison buildings built during the colonial era. Although the prison was never fully used as originally planned, the ruins remain as an important reminder of Zanzibar’s history.
Walking through the site gives visitors insight into the island’s past and its role during different historical periods.
✓ Swim in Turquoise Waters
Prison Island is surrounded by beautiful clear ocean water, making it an excellent place for swimming and relaxing.
The atmosphere is calm, the beaches are peaceful, and the sea is refreshing — perfect after exploring Stone Town.
✓ Snorkeling and Marine Life
Many visitors also enjoy snorkeling around the island. The waters near Prison Island often offer sightings of:
- Tropical fish
- Coral reefs
- Sea urchins and starfish (observe carefully)
- Beautiful underwater landscapes
Snorkeling conditions depend on the tide and season, but overall it is one of the best quick snorkeling spots near Stone Town.
How to Get There
Prison Island is easily accessible by boat from Stone Town. The boat ride normally takes around 20 to 30 minutes, offering scenic views of Zanzibar’s coastline.
Most tours include transport, entrance fees, and a guide.
How Long Should You Spend There?
A Prison Island excursion is usually a half-day tour, lasting about 3 to 5 hours, depending on whether you combine it with snorkeling or Nakupenda Sandbank.
Many travelers choose to combine:
✅ Prison Island + Nakupenda Sandbank
for a full and unforgettable ocean day.
Best Time to Visit Prison Island
The island can be visited year-round, but the best months are:
- June to October (cooler, dry season)
- December to February (hot, sunny season)
Morning tours are recommended for better weather and clearer waters.
Who Should Visit Prison Island?
Prison Island is ideal for:
✓ First-time visitors in Zanzibar
✓ Families with children
✓ History and culture travelers
✓ Wildlife and nature lovers
✓ Travelers staying in Stone Town
Final Note
Prison Island is one of Zanzibar’s must-visit destinations. It combines historical landmarks, peaceful beaches, and the rare opportunity to see giant tortoises up close. Whether you go for the history, the snorkeling, or the wildlife, this tour is a memorable part of any Zanzibar itinerary.
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