Tanzania has a third island, and it is the one that gets talked about least. Most travellers heading for a beach stay after their Serengeti safari automatically reach for Zanzibar -- which is wonderful -- but travellers who know the Indian Ocean coastline well tend to quietly mention Mafia Island Tanzania and Pemba Island as places where the real magic is hiding. These are the offshore islands that the dive industry talks about in reverent tones, the ones that appear on the bucket lists of serious marine naturalists, and the ones that remain, by intent and by geography, genuinely difficult to reach.
That difficulty is, of course, entirely the point.
This guide compares Mafia and Pemba honestly: the diving, the beaches, the accommodation, the access, and the kind of traveller each island suits. If you are considering adding one of Tanzania's quiet islands to a safari and beach itinerary, read this first.
Overview: Where These Islands Sit
Mafia Island lies in the Indian Ocean approximately 130 kilometres south of Dar es Salaam and sits at the mouth of the Rufiji River delta. The freshwater outflow from the Rufiji creates an unusually nutrient-rich marine environment that supports whale sharks, manta rays, and exceptionally diverse reef fish. The island has a small population of around 40,000 and virtually no mass tourism.
Pemba Island sits 80 kilometres north of Zanzibar and just off the northern Tanzanian coast. It is the less-visited sibling to Zanzibar within the Zanzibar Archipelago, administratively part of the same semi-autonomous region. Pemba is sometimes called the Green Island for its heavily forested interior -- clove farming, not tourism, drives its economy.
Side-by-Side Comparison
| Feature | Mafia Island Tanzania | Pemba Island |
|---|---|---|
| Location | South of Dar es Salaam | North of Zanzibar |
| Access | Charter or light aircraft from Dar es Salaam (30-40 min) | Light aircraft from Zanzibar (30 min) or ferry |
| Diving quality | World-class; whale sharks, manta rays, healthy reefs | World-class; walls, channels, drift diving |
| Best diving season | October to March (whale sharks); year-round otherwise | October to April; monsoon limits July-August |
| Beach quality | Good; quieter and less manicured than Zanzibar | Limited public beaches; more jungle-to-sea feel |
| Accommodation range | Very small; 4-6 lodges, no large resorts | Very small; 2-3 lodges, exclusive feel |
| Indicative lodge rate | USD 300-700 per person per night (full board) | USD 500-1,000+ per person per night (all-in) |
| Cultural tourism | Dhow sailing, local village visits, fishing | Clove farms, mangrove channels, village culture |
| Suitability | Divers, naturalists, escapists | Advanced divers, very serious escapists |
| Infrastructure | Basic but functional | Minimal; this is the draw and the challenge |
Mafia Island Tanzania: The Whale Shark Island
The Marine Environment
Mafia Island Marine Park (established 1995) covers 822 square kilometres and is Tanzania's first marine park. The park's defining feature is the aggregation of whale sharks that feed in the shallow waters near Ras Kinasi between October and March. Whale shark snorkelling here is among the most reliable in the entire Indian Ocean -- these are enormous, docile filter feeders (the world's largest fish), and encounters in the shallow, nutrient-rich water are often extended and relaxed.
Beyond the whale sharks, Mafia's reefs are genuinely pristine. Limited visitor numbers and strong local conservation management mean that the coral coverage is extraordinary compared to more heavily visited sites. Green and hawksbill turtles nest on the beaches from July to September. Manta rays aggregate at specific cleaning stations, particularly around Forbes Bay and Chole Bay.
The Diving
Dive sites include Kinasi Pass (a channel dive with strong currents and impressive pelagic life), the Outer Wall (where the reef drops away vertically to depths beyond 40 metres, with good shark activity), and Chole Bay's inner sites (shallower, calmer, excellent for learners and photographers). Most lodge dive centres offer full PADI instruction through to advanced and speciality courses.
The wreck of the SMS Koenigsberg -- a German WWI cruiser sunk in the Rufiji delta -- is accessible by boat from Mafia for wreck diving enthusiasts, though it is a longer journey into the estuary.
The Land Experience
Mafia Island itself is low-lying, green, and quiet. Chole Town on the adjacent Chole Islet (reached by dugout canoe from the main island) has ruins of 18th-century Arab merchant buildings overgrown with fig trees -- it looks like a set from an adventure film. Local women run a workshop producing handmade batik and weaving; community dhow-building continues in a working yard visible from the water.
There are no beach bars, no craft market, no nightlife. Evenings are for watching the bats emerge over the palm trees and listening to the Indian Ocean.
Pemba Island: For the Serious Diver
What Makes Pemba Unique
Pemba's reputation in the global dive community rests on one thing: its walls. The island is surrounded by an underwater cliff that drops from the surface to depths beyond 200 metres -- among the most dramatic underwater topography in East Africa. Strong channel currents flush the walls with nutrient-rich water, supporting vast schools of fish, large grouper, barracuda, and sharks. Drift dives along the Pemba Channel are exhilarating and require some experience to manage safely.
This is not a destination for beginners. The best dive experiences at Pemba require at least Advanced Open Water certification and comfort with drift diving.
The Island Experience
Pemba's interior is beautiful in a way that is completely different from Zanzibar: densely forested hills, clove plantations filling the air with fragrance after rain, and dhow-building yards at the water's edge. The island feels untouched by the tourist economy in a way that Zanzibar, despite its own considerable charms, simply cannot replicate.
Public beaches are limited compared to Zanzibar. The island's topography means much of the coastline is mangrove or rocky. The beaches that do exist -- around Wete in the north and near the handful of lodges -- are beautiful but not the broad, photogenic expanses of Nungwi.
Accommodation
Pemba has very few lodges. The flagship property -- a private island lodge accessible only by boat -- is one of the most exclusive addresses in East Africa, with full-board all-inclusive rates that reflect its remoteness and the quality of the diving programme. For most travellers, Pemba makes sense as a 3-4 night add-on to a Zanzibar stay rather than a standalone destination.
How to Choose Between Them
Choose Mafia Island Tanzania if: - You want whale shark encounters (October to March is peak) - You are a mixed group including non-divers who still want a beautiful, quiet Indian Ocean escape - You are combining with a southern Tanzania safari (Ruaha, Selous/Nyerere) rather than the northern circuit - Budget is important -- Mafia offers better value per night than Pemba
Choose Pemba Island if: - You are a committed diver who specifically wants wall and drift diving - Absolute remoteness and exclusivity matter more than beach quality - You are already visiting Zanzibar and want to add a 3-night contrast - You have done Mafia before and want something even quieter
Practical Considerations
- Access to both islands is limited. Coastal Aviation and Auric Air operate light-aircraft connections from Dar es Salaam (Mafia) and Zanzibar (Pemba). Weather cancellations are possible; build flexibility into your schedule.
- Neither island has a hospital. Dive-related medical emergencies require evacuation to Dar es Salaam; both lodge operations are aware of this and carry appropriate first-aid and emergency oxygen equipment.
- Internet connectivity is limited to slow and intermittent on both islands. This is, again, entirely the point.
- Best combined with: Mafia pairs naturally with Ruaha, Nyerere (Selous), or Mikumi in southern Tanzania. Pemba pairs naturally with Zanzibar and the northern Tanzania safari circuit.
Waigumo Safaris has first-hand experience with both Mafia Island Tanzania and Pemba Island and can design itineraries that combine the right island with the right safari. If you are trying to decide which suits your trip better, talk to our team -- we will be honest about what each island offers and what it does not.
