Mnemba Atoll lies off Zanzibar’s north-east coast and is protected as a marine conservation area. Boat trips from Matemwe, Nungwi and Kendwa take snorkellers to its reef, which has coral, reef fish, turtles and frequent dolphin sightings. Visitors pay a marine conservation fee, and the island itself is private. Visibility is often best from about September to March.
Key takeaways
- Protected marine conservation area.
- Coral, reef fish, turtles and dolphins.
- Boats from Matemwe, Nungwi and Kendwa.
- Marine conservation fee applies.
Mnemba is a small island surrounded by a large oval reef. The island itself is privately leased for a luxury lodge and cannot be visited, but the reef around it is open to snorkellers and divers within a marine conservation area.
What you see
- Coral gardens with brain, table and staghorn corals.
- Reef fish: parrotfish, angelfish, butterflyfish, lionfish and moray eels.
- Green and hawksbill turtles.
- Starfish, seahorses and octopus on the sandy bottom.
- Dolphins: spinner and bottlenose dolphins are often seen on the way.
How a trip works
Boats leave in the morning from Matemwe, the closest beach, or from Nungwi and Kendwa. After about 20 minutes to an hour on the water, depending on your starting point, you snorkel in the clear, shallow water around the reef. Many trips include fruit, drinks and a second snorkelling stop. Masks, snorkels and fins are provided.
Conservation fees
A marine conservation fee is charged per visitor, set by Zanzibar’s authorities and revised in 2025. It funds patrols and reef protection. Your operator usually collects it.
Dolphins: watch, don’t chase
Some boats chase dolphins so that guests can jump in beside them. This stresses the animals. Choose operators that watch from a distance and let the dolphins approach.
When to go
Snorkelling is possible year-round. The water is often clearest from about September to March. The long rains, April and May, and windy periods can reduce visibility.
Good to know
- Use reef-safe sunscreen and wear a rash vest.
- Do not touch or stand on coral.
- Ask for a life jacket if you are not a strong swimmer.
- Combine with beaches of northern Zanzibar.
Who it suits
Mnemba suits families, couples and beginners, as the water is shallow and calm. Divers can join dives on the outer reef.
Diving at Mnemba
Mnemba is also Zanzibar’s best dive site, with walls and drop-offs on the outer reef. Beginners can do try-dives, and dive centres in Nungwi and Matemwe run courses.
Costs
Shared half-day snorkelling trips are good value, while private boats cost more but let you choose your own timing. The conservation fee is paid on top.
Marine life to look for
- Green turtles, grazing on seagrass near the reef.
- Hawksbill turtles, with their pointed beaks, feeding on sponges.
- Clownfish in anemones.
- Moorish idols, triggerfish and surgeonfish in bright colours.
- Blue-spotted stingrays resting on the sand.
- Octopus hiding in crevices, best spotted with a guide.
Snorkelling tips for beginners
- Practise in shallow water first, breathing slowly through the snorkel.
- Defog your mask with a drop of baby shampoo or anti-fog solution.
- Float on the surface and kick gently from the hips; avoid kicking near the coral.
- Stay close to your guide and boat, and signal if you feel tired.
- Wear a rash vest or T-shirt to protect your back from the sun, which is strong on the water.
Choosing an operator
Good operators provide well-fitting masks and fins, life jackets, a guide in the water, and a briefing on reef rules. They keep a respectful distance from dolphins, collect the conservation fee and avoid overcrowded spots. We work with operators we have checked.
Combining Mnemba with other trips
Many trips combine snorkelling with a stop at a sandbank or a beach for lunch. From Stone Town, half-day trips to Prison Island and the Nakupenda sandbank are an alternative, but the reef at Mnemba is better for coral and fish.
Protecting the reef
Coral reefs around Zanzibar face pressure from warming seas, overfishing and careless visitors. Never stand on or touch coral, do not feed fish, and take all rubbish back to shore. Reef-safe sunscreen without oxybenzone helps, as does choosing operators that moor on buoys rather than dropping anchors on the reef.
Plan it
Add Mnemba to our 4-day Zanzibar beach holiday or 12-day gorillas and Zanzibar honeymoon. See also dhow sunset cruise.
Frequently asked questions
Can I visit Mnemba Island itself?
No. The island is private; snorkellers visit the reef around it.
Will I see dolphins?
Often, but sightings are never guaranteed.
Is it suitable for beginners?
Yes. The water is shallow and usually calm.
When is the best time?
About September to March for the clearest water.
Is there a fee?
Yes, a marine conservation fee per visitor.
How long is the boat ride to Mnemba?
About 20 minutes from Matemwe and up to an hour from Nungwi or Kendwa.
Can children snorkel at Mnemba?
Yes, with life jackets and child-sized masks; the shallow reef is ideal for confident young swimmers.
Written by our Kampala-based planners and guides, who arrange these trips every season. Prices and rules are checked before every quote.
