Start here
Last checked: October 2026.
Diving in Zanzibar is not the Red Sea and does not try to be. What it offers is warm, easy water close to the beach, reefs busy with fish rather than famous for drama, and — for those who want it — two genuinely serious dives: a seamount in open ocean and an island whose reef falls away into a channel hundreds of metres deep. Matemwe suits beginners, Nungwi and Kendwa suit divers after Leven Bank, and Pemba suits experienced divers who want walls.
The detail
| Site | Coast | Depth | Level | Best months |
|---|---|---|---|---|
| Mnemba Atoll | North-east, off Matemwe | 2–35 m | All certified divers; courses | Jan–Mar, Jul–Oct |
| Tumbatu Island | North-west, off Kendwa and Nungwi | 3–12 m | Beginners; courses | Jan–Mar, Jul–Oct |
| Leven Bank | Open ocean north of Nungwi | 12–55 m | Advanced only | Jan–Mar for a calmer surface; Jul–Oct for humpbacks |
| Stone Town wrecks and reefs | West, off the harbour | 4–24 m | Beginner to intermediate | Jan–Mar, Jul–Oct |
| Pemba walls | Pemba island, across the channel | 3–60 m+ | Experienced | Jan–Mar, Jul–Oct |
Mnemba Atoll — the easy classic. Boats from Matemwe, Nungwi and Kendwa all work the ring of reef around the private island. Kichwani (2–30 m) and Wattabomi (6–30 m) are sloping gardens of plate and bommie coral that suit any certified diver and most courses; Big Wall (18–35 m plus) is the one to ask for if you are advanced and want to get below the snorkellers. Visibility is usually 20 metres or better. The catch is company: by mid-morning in season it is the most crowded water in the archipelago, and local operators advise going early or going deeper. Conservation fees apply; see snorkelling at Mnemba Atoll.
Leven Bank — the big one. An underwater mountain in open ocean well north of Nungwi, topping out at 12–14 metres and dropping past 55. Strong current, a surface that can be rough, and the reward of pelagics — tuna, kingfish, barracuda, trevally, reef sharks — and, roughly July to October, the chance of humpback song on the descent, most often reported in August–September, though timing varies by year. Centres require Advanced Open Water and will want to know how recently you have dived in current. Kendwa operators quote 20–40 minutes to their advanced sites, so treat Leven Bank as its own morning.
Tumbatu Island — the quiet alternative. A short ride west of Nungwi, 3–12 metres of healthy, less-visited reef with excellent macro life: nudibranchs, leaf fish, seahorses and resident green turtles. Visibility is lower than Mnemba, but the coral is in better shape. The right place to finish an Open Water course.
Stone Town — wrecks and sandbanks. The Great Northern, a British cable-laying ship lost on New Year's Eve 1902, lies in 4–12 metres off the town, broken but coral-encrusted; with the Bawe and Pange reefs it makes a half-day from the harbour.
Pemba — the walls. Across the channel to the north, Pemba is a different sport: Fundu Reef steps from 3 to 60 metres, Manta Point sits around 40, and the Pemba Channel beyond falls to hundreds of metres. Visibility of 30–40 metres is normal. It suits experienced divers who want drop-offs and big fish without crowds. Lodges on Pemba with diving and snorkelling include The Manta Resort, Fundu Lagoon and The Aiyana Resort & Spa. The Pemba Channel Conservation Area charges its own $10 entry fee under the 2025 tariff. Whether to base there at all is the question answered in Pemba or Zanzibar?.
Seasons, plainly. Water sits around 27 to 30°C year-round, though sources differ; a 3 mm shorty is plenty. The calm, clear months are January–March (kaskazi, warm and flat) and July–October (kusi, cooler, choppier on the surface but clear below). March to May is the long rains: some centres close in April and May, and visibility drops. Most north-coast sites are workable at any tide, according to local operators; east-coast dives around Paje and Matemwe have windows set by the tide, which Zanzibar tides explained covers.
Reef manners. Do not touch or stand on coral. The Tumbatu turtles are wild — give them room and never chase one. If humpbacks surface, the boat keeps its distance.
Courses and certification. PADI 5-Star centres have bases in Kendwa, Matemwe and Stone Town, among others. A Discover Scuba session needs no certificate; the Open Water course runs about three days with four open-water dives, and the minimum age is 10. Advanced Open Water adds five dives over two to three days, minimum age 12. As a guide, Open Water courses are quoted at roughly US$400–600, usually including equipment hire, course materials and certification; one 5-Star centre lists a single guided dive at about US$85 and a two-dive trip at US$110, with marine conservation fees extra. The diver safety body DAN advises at least 18 hours after repeated no-stop dives before flying, or 12 hours after a single dive. That is a minimum, not a guarantee, and it is longer after decompression dives; follow your dive centre's briefing and your own doctor's advice. This is general information, not medical advice.
Key facts
Sites: Mnemba (2–35 m, all levels; crowded), Tumbatu (3–12 m, quiet macro), Leven Bank (12–55 m, advanced, current), Stone Town wrecks (4–12 m, calm), Pemba walls (3–60 m+, experienced). Water: roughly 27–30°C all year. Clearest: Jan–Mar and Jul–Oct. Avoid: April–May, when some centres close (long rains run March–May). Humpbacks: roughly Jul–Oct, most often reported in Aug–Sep at Leven Bank; timing varies by year. Min age: 10 for Open Water, 12 for Advanced. Cost guide: Open Water ~US$400–600, usually with equipment; two-dive trip ~US$110 at one 5-Star centre. Fees: Mnemba $25, Pemba Channel $10 (non-East African adults). No-fly: DAN advises at least 18 hours after repeated no-stop dives (12 after a single dive), a minimum, and longer after decompression dives; follow your centre's and doctor's advice. Conduct: no touching coral or turtles; boats keep their distance from whales.
Planning it with Nobu
A travel designer matches the coast to the diver. A couple with one Open Water certificate between them belongs in Matemwe with an early Mnemba boat, not on an open-ocean run to Leven Bank; an experienced pair who want Leven Bank and a Pemba wall need Nungwi and then a Pemba lodge that offers diving on site. The diving can be placed where the tide and the wind allow it, and the flight home can sit comfortably after the no-fly window.
Is it right for you?
You want warm, easy diving on a holiday that is also a beach, a town and a safari finish. It suits first-timers and newly qualified divers (Mnemba, Tumbatu, the Stone Town wreck) and rewards advanced divers who make the effort for Leven Bank or Pemba. It is less right if you want big-animal diving as the whole point of a trip; for whale sharks go to Mafia, where the season runs October to March with a peak from November to February, and for pure wall diving base on Pemba.
Journeys to consider
- Shores of Zanzibar — the short island journey, with dive mornings placed where the water is clearest. → Shores of Zanzibar
- Southern Safari & Spice — Tanzania's parks, then the north coast for Mnemba and Leven Bank. → Southern Safari & Spice
- Zanzibar and Pemba island-hop — easy reefs first, then Pemba's walls. → Zanzibar and Pemba island-hop
