A protected reef off Zanzibar's north-east coast, popular for snorkelling, diving, turtles and dolphins around a private island
Mnemba lies off the north-east coast of Zanzibar's main island, opposite Muyuni beach. At its centre is a small, roughly triangular island ringed by white sand and casuarina trees, around 500 metres across, which is home to a single exclusive lodge. Around it stretches a large oval reef, often called an atoll even though it has no enclosed lagoon, where shallow coral gardens drop away into deeper blue water.
The reef draws snorkellers and divers from all over the island. Visibility is often good, reef fish are abundant, green turtles feed and nest here, and pods of dolphins are frequently seen on the crossing. Day trips leave from the north and east coasts, and many divers based in Nungwi or Matemwe visit several times during a stay.
The waters around Mnemba Island have been protected as a marine conservation area, managed under a partnership between government authorities, local communities and conservation organisations. Zanzibar's Department of Fisheries Development has overall responsibility for its marine conservation areas, with local rangers and village committees involved in day-to-day management, and the Mnemba area is leased to a private manager.
The island itself is privately run, and non-guests may not land or enter a 500-metre zone around it. Since 1996 a monitoring and protection programme has followed the green turtles that nest on its beaches, and work continues with conservation groups such as Oceans Without Borders. With Zanzibar receiving hundreds of thousands of visitors a year, keeping tourism pressure on popular reefs like this one under control is an ongoing task.
Fishing communities along the north-east coast have long used these reefs, and village committees take part in managing Zanzibar's marine conservation areas alongside government rangers. Many of the boat crews and guides who run trips to Mnemba come from the coastal villages facing the reef.
Most visitors join a half-day or full-day boat trip from the north-east coast, including Matemwe and Muyuni, or from Nungwi and Kendwa further north. Snorkelling stops are usually on the shallower parts of the reef, while dive centres take divers to deeper sites. Trips often include fruit or lunch on board, and some offer time on a sandbank, though landing on the island itself is not allowed.
If you want to see dolphins, choose an operator that keeps its distance and does not chase them. The calmest seas and best visibility usually come in November and March, but trips run for most of the year.
Trips run year-round, but the calmest conditions and best visibility usually come in November and March. The long rains from March to May can bring rougher crossings and frequent showers. Green turtle nesting on Mnemba Island takes place between February and September.
Checked against the sources on 28 October 2026. Opening times and fees can change — confirm before you go.
General guidance from our specialists, not official information.
The villages of Matemwe and Muyuni face the reef across a short channel, and Nungwi and Kendwa at the island's northern tip are a short drive away. Stone Town is about an hour and a half by road.
Tanzania · 10 nights5★ LodgeTanzania · 8 nights5★ LodgeTanzania · 5 nights5★ LodgeThis guide was researched from the sources below and reviewed by our team on 28 October 2026. Facts under “Verified information” link to the page they were checked on; travel tips are general guidance. Photos are credited on each image. The ambient recording’s author and licence are shown in the sound player.
