Diving & Snorkelling in Zanzibar: Mnemba Atoll, Sites & Operators

The diving and snorkelling around Zanzibar ranges from mediocre inshore sites near Stone Town to genuinely world-class reef at Mnemba Atoll on the northeast coast. Knowing which sites to target, which operators to use, and what time of year to come makes a significant difference to the experience.

Mnemba Atoll

Mnemba Atoll is a privately owned island 4 km east of Matemwe beach, surrounded by a circular reef that drops from a shallow lagoon (3–8 metres) to a wall and outer slope reaching 30+ metres. The &Beyond Mnemba Island private lodge sits on the island itself; the reef surrounding it is managed as a conservation area.

Entry to the Mnemba Conservation Area costs approximately USD 10 per person per dive or snorkel visit (as of 2026), collected by your dive operator and paid to the conservation authority.

What you’ll find at Mnemba:

• Green and hawksbill turtles at nearly every dive — they feed on the seagrass beds inside the atoll
• Bottlenose dolphins frequently encountered on the way out and back
• Reef sharks (whitetip, blacktip) along the outer slope
• Large schools of fusiliers, batfish, and barracuda
• Soft coral gardens at 10–18 metres on the east face
• Occasional hammerhead sharks and whale sharks during November–February

Best Mnemba dive sites:

• Spanish Dancer: South face of the atoll, 15–25 metres. Named for the Spanish Dancer nudibranch frequently seen here. Strong current possible; best for confident open-water divers.
• Kichwani: East face, 8–20 metres. The most consistent turtle site. Suitable for beginners.
• Aquarium: Inside the lagoon, 3–12 metres. Calm and clear; ideal for snorkellers and first dives.
• Big Wall: Outer northwest face, 18–35 metres. Wall dive with sea fans, sponges, and larger pelagics. For experienced divers.

Other Dive Sites Around Zanzibar

Blue Hole (near Nungwi): A volcanic feature on the northwest reef — a vertical shaft to 50+ metres surrounded by healthy coral. Suitable for advanced divers. Stonefish and frogfish are regularly spotted here.

Hunga Wall (near Kendwa): Drift dive on a coral wall from 8–28 metres. Strong currents run predictably from May–August; plan the dive with the current direction.

Leven Bank: A submerged pinnacle approximately 8 km northeast of Stone Town. The furthest dive site from shore — expect 30+ minutes by boat from Matemwe. Known for hammerhead shark encounters September–November. Limited operators run trips here.

Tumbatu Island: Northwest of Nungwi, a shallow coral garden (5–18 metres) around an uninhabited island with good diversity: pipefish, seahorse, and ghost pipefish have been recorded.

Chumbe Island: A protected marine reserve on the southwest coast, 12 km south of Stone Town. The reef here is in exceptional condition due to strict conservation. Access is via Chumbe Island Coral Park, which runs day trips for approximately USD 115 per person including snorkelling guide, lunch, and nature walk. No scuba diving permitted inside the park.

Dive Operators

One Ocean Zanzibar: The largest and most experienced dive operator on the island. Bases at Stone Town and Matemwe. Two-tank Mnemba dive approximately USD 110 including equipment. PADI Open Water course approximately USD 450. Well-regarded safety standards and English-speaking instructors.

Zanzibar Watersports: Based at Nungwi. Competitive pricing, particularly for certified divers doing multiple dives. Two-tank dive from USD 90. Better positioned for Blue Hole and Hunga Wall.

East Africa Diving (EAD): Based at Matemwe Beach Village. Smaller operation, more personal guiding. Mnemba two-tank dive from USD 105.

Chumbe Island Coral Park Snorkelling: Day trips from Stone Town for non-scuba visitors wanting the best snorkelling experience on the island without a boat trip to Mnemba. Approximately USD 115 per person.

Costs Summary (as of 2026)

Activity	Approximate Cost
Mnemba snorkel trip	USD 40–55 per person
Two-tank Mnemba dive (equipment included)	USD 105–120 per person
PADI Discover Scuba (introductory, no cert needed)	USD 80–100
PADI Open Water certification course	USD 420–500
PADI Advanced Open Water	USD 380–450
Chumbe Island day trip (snorkel, lunch)	USD 115 per person

When to Go

Best visibility: June–October. Water is clearer (20–30+ metres at Mnemba), seas are calmer, and the north coast is at its best. Temperatures hover around 24–26°C in the water.

Whale shark season: October–March. Peak November–February. Occasional encounters are possible year-round.

Turtle nesting: November–February on the beaches around Mnemba and Matemwe. Hatchlings emerge from March. Some dive operators offer guided turtle-nesting walks in season (usually free for lodge guests).

Avoid: April and May. The long rains bring poor visibility (8–12 metres), rough seas, and some dive operators reduce their schedule or close temporarily. Some sites become inaccessible due to swell.

What to Bring

Most operators provide all equipment. If you have your own dive computer, mask, or fins, bring them. Wetsuits are typically 3mm — the Indian Ocean stays above 23°C at depth throughout the year.

Reef-safe sunscreen only (no oxybenzone or octinoxate) — both chemicals harm coral and are subject to ban at some marine parks.

Zanzibar’s dive community is conservation-minded. Do not collect shells, touch coral, or harass marine life — instructors and guides enforce this actively.

Browse Zanzibar diving, snorkelling, and water tours to compare operators and book online before arriving on the island. Travel insurance for Tanzania should include water sports and diving cover if you’re planning a dive trip to Mnemba — standard travel insurance often excludes scuba at depth.