Snorkelling at Mnemba: the island you are not allowed to land on

Mnemba is the single most photographed thing on Zanzibar that almost no visitor sets foot on. It is a small wooded island about 3 km off the north-east coast, it is private, and the beach belongs to the lodge that leases it.

The most-booked Mnemba trip in the current stock – 2,168 reviews, more than any other outing that takes place on the island itself – says so in its own description, in the operator’s own English: “Mnemba a private island we couldn’t go inside.” Which is the right expectation to arrive with, because what you are actually buying is the water around it.

What you are buying is the reef, not the island

There are 29 offers in the stock with Mnemba in the title, from €14.41, median €61.49, carrying 5,246 reviews between them. They depart from Nungwi, Kendwa, Matemwe or Muyuni – Matemwe is the closest beach and the shortest crossing, and anything sold from Stone Town is a long drive before you see a boat.

The reef itself is the reason to go. It is shallow, sheltered from the open ocean by the atoll, and genuinely suitable for people who are not strong swimmers – one recent reviewer on the most-booked trip describes being led round the coral by the hand. You are looking at fringing reef in clear, warm, waist-to-chest-deep water in places, with the density of fish that a protected reef gets and an unprotected one does not.

That is not an accident, and the rules behind it are worth understanding before you compare prices.

The eight-boat rule, and where your boat actually goes

In late 2023 the Zanzibari government and the Mnemba Island Conservation Area (MIMCA) proclaimed a marine special area around the island, developed with &Beyond, the company that runs the lodge. The published terms of the restricted zone are unusually specific:

• it extends in a radius of between 400 m and 700 m around the island
• a permit system and a levy apply
• a maximum of eight boats a day, each carrying up to seven tourists and two crew
• access is limited to specific hours
• no anchors may be used, to protect the seabed

Do the arithmetic and something becomes obvious. Eight boats times seven guests is 56 visitors a day inside that ring. The Mnemba offers alone have collected over five thousand reviews. The boat you book for €48 is almost certainly not one of the eight.

That is not a scandal and it does not make the trip worse. The atoll is considerably bigger than the restricted ring, and the reef sites the day boats use are good ones. But it does mean the phrase “snorkelling at Mnemba Island” in a listing describes a general area, not a place you will be taken to within 400 metres of. If a listing implies privileged access to the restricted zone, that is the claim to ask about, in writing, before paying.

There are 88 snorkelling trips from €10 at snorkelling.

The conservation fee: who charges it and what it pays for

Two separate charges get muddled here, and both are real.

The Ministry of Blue Economy and Fisheries, through its Department of Marine Conservation, issued a public notice revising entry fees for Zanzibar’s marine conservation areas with effect from 1 September 2025. For the listed areas, which include the Mnemba Island Conservation Area, non-East African visitors pay USD 10 per adult and USD 5 per child; non-East African residents of Tanzania USD 5 and USD 3; East African citizens TZS 5,000 and TZS 2,500; under-fives go free. Separately, a rate structure reported at USD 10 to 25 depending on residency and nationality is applied to the Mnemba special area itself.

Where the money goes was published with the tariff, as a split across three priority areas, of which two were named: 45 per cent to conservation work – patrols and artificial reef planting – and 30 per cent to the adjacent communities and fisheries committees. That is a better answer than most destinations can give, and it is a reasonable thing to be paying for.

The practical test when you compare listings is one line. The most-booked Mnemba trip names “conservation fees” in its inclusions. Others do not, and you will pay in cash on the water. A €14 trip and a €30 trip can be the same boat with the fee on different sides of the line – the same trap as on the Prison Island and Nakupenda run.

The dolphin stop is the weak half of the day

Nearly every Mnemba trip bundles a dolphin stop on the way out, and this is the part of the day most likely to disappoint or to make you uncomfortable.

The operator of the most-booked trip puts a warning in its own booking notes, unprompted and against its own interest:

“We would like to express our concern regarding the part of dolphin watching. Unfortunately, there are many boats in the area and while we have no control over them, they tend to surround the dolphins in a way that can resemble hunting, which we don’t support.”

The same listing is equally plain that sightings are not guaranteed, because it is the open ocean. Reviewers on that trip say the same thing from the other side: the snorkelling was the highlight, the dolphin crowd was not.

If the dolphins are the reason you are booking, read swimming with dolphins in Zanzibar first. There are 90 dolphin trips from €14.41 at swim with dolphins, and the honest version of that outing is not the cheap one.

Practical points

Go early. The first boats out get the clearest water and the fewest neighbours, and the wind usually gets up through the morning.

Motion sickness. The most-booked trip lists people prone to it as unsuitable, which is an unusually frank thing for a listing to say. It is a crossing in an open boat over open water. What helps without any preparation is an early departure, a seat amidships and keeping your eyes on the horizon; for anything beyond that, ask a pharmacy before you travel.

The sandbank is conditional. Several listings promise time on the sand at Mnemba. Read them closely – the most-booked one says “if there is a low tide”. That is a bar of sand, not the island’s beach, and it is governed by the tide rather than the schedule.

Bring nothing you cannot lose overboard, and reef-safe sun cream if you have it. You are swimming over coral that is being actively replanted; the nursery work around the island has been running since 2021.

Where Mnemba sits relative to everything else, and how far it is from wherever you are staying, is in what to see in Zanzibar.