Tanzania’s three main Indian Ocean island territories — Zanzibar (Unguja Island, 85 km off Dar es Salaam), Pemba (80 km north of Zanzibar), and Mafia (120 km south of Zanzibar) — each offer a fundamentally different Indian Ocean experience. Choosing between them should be based on what you actually want from the island portion of your Tanzania safari — there is no universally “best” island, only the right one for your specific interests. This guide compares all three for 2025, covering marine activities, cultural interest, accessibility, and costs, with a clear recommendation for different visitor types.
Zanzibar: History, Culture and a Developed Beach Scene
Zanzibar is the right choice for: visitors who want a full cultural and historical experience alongside beach time; couples or groups wanting beach nightlife (Zanzibar has East Africa’s best beach party scene, particularly around Nungwi and Kendwa); first-time Tanzania visitors for whom the island experience is a post-safari relaxation extension. The Stone Town UNESCO heritage site (described in detail in a separate guide), the spice farms, and the Slave Memorial at the Cathedral provide historical depth that Pemba and Mafia completely lack. The beach scene: Nungwi and Kendwa on the north coast have the best beach infrastructure — beach bars, sunset dhow cruises, water sports operators. The south and east coast beaches (Paje, Jambiani) are quieter and preferred by kitesurfers (consistent SE trade wind). Accessibility: very good — scheduled flights from Dar es Salaam (25 minutes, USD $70–100 one-way), ferry from Dar es Salaam (2 hours, USD $35–50 economy). Accommodation price range: wide, from USD $30/night guesthouse in Stone Town to USD $800+/night luxury resort on the north coast.
Pemba: Unspoiled Diving and Authentic Island Life
Pemba is the right choice for: serious scuba divers who want the best reefs in the western Indian Ocean without the crowds of Zanzibar; travellers seeking a genuinely untouched, un-commercialised island experience; visitors interested in the clove agriculture heritage. Diving: Pemba Channel’s walls (described in the dedicated Pemba guide) are considered among the Indian Ocean’s finest — the coral coverage and fish biomass are qualitatively superior to Zanzibar’s most-visited sites. There is one dive centre on Pemba (Manta Reef Lodge, USD $60/dive) — the limited infrastructure is both a constraint and the reason the reefs are pristine. Cultural interest: significant — the clove estates, the dhow building yards at Mkoani, and the traditional fishing communities provide genuine cultural content, but no UNESCO heritage site comparable to Zanzibar Stone Town. Accessibility: scheduled flights from Zanzibar and Dar es Salaam (30–60 minutes, USD $100–150 one-way). Accommodation: very limited — Manta Reef Lodge plus a handful of basic guesthouses. Not suitable for visitors who need hotel-standard facilities.
Mafia: Whale Sharks, Pristine Reef and Remote Luxury
Mafia is the right choice for: visitors specifically targeting whale shark encounters (Mafia has the highest-concentration whale shark aggregation on the East Africa coast from October–February); experienced divers who have dived Zanzibar and want the best Tanzania diving without tourist infrastructure; and visitors seeking remote, high-end accommodation in a genuinely wilderness marine setting. Whale sharks: the Mafia Channel (between Mafia Island and the Tanzania mainland) aggregates whale sharks in large numbers for October–February — guided swim-with-whale-shark tours (snorkelling, not diving — whale sharks are at the surface) operate from all Mafia lodges during this period. The snorkelling experience (3–6 individual whale sharks in a single morning, each 6–10 m in length) is the East Africa marine experience with the highest physical emotional impact. Reef: Mafia Island Marine Park (Tanzania’s oldest marine park, 1995) has the highest coral coverage in the western Indian Ocean — the Chole Bay inner reef system is recommended for beginner and intermediate divers. Accessibility: fly-in only from Dar es Salaam (45 minutes, USD $80–120 one-way on Coastal/Auric). Accommodation: 4–5 lodges, price range USD $250–600/night per person full-board.
The Verdict
- First-time Tanzania visitor wanting beach post-safari: Zanzibar
- Serious diver wanting the best reef: Mafia (for whale sharks October–February) or Pemba (for coral wall diving year-round)
- Adventure traveller wanting something genuinely different: Pemba
- Family with mixed beach/cultural interests: Zanzibar
- Photographer focused on marine life: Mafia for whale sharks; Pemba for reef biodiversity
