The Underwater Waterfall Is an Optical Illusion — and Two of These Flights Don't Show It to You

The underwater waterfall is the picture that sells Mauritius, and the first thing to know about it is that there is no waterfall. Sand and silt flowing off the edge of the shelf create the appearance of water cascading into the ocean — one operator describes it in exactly those terms on its own booking page. It only works from the air, and only in the right light.

For most people: the east-coast seaplane flight at €230, which names the illusion in its description and flies over Île aux Cerfs and Lion Mountain with it. If you want a long flight rather than a short one: the scenic helicopter trip at €768.74 runs three hours with hotel transfers. Do not book the other seaplane expecting the waterfall — its own reviews say so.

What is on offer in the air

Those are per-person prices. A fifth offer flies the same illusion by private helicopter at €3,550 for up to four people, and carries a single review.

The complaint that should decide your booking

The €215 seaplane is the better-rated of the two at 4.5 stars, and its reviewers are happy about the lagoon, the reef and the pilots. But GetYourGuide’s own summary of them records a specific grievance: travellers say clearer route details would help, especially that the underwater waterfall is not included.

That is as clean a warning as a booking page ever gives you. The flight is good; it is simply not the flight people thought they had bought. It departs from a seabase at a hotel on the north-east coast and flies that coastline.

The €220 flight, by contrast, puts the illusion in its first sentence and sells three lengths over it: 15 minutes over the lagoon, a 20-minute version between Trou d’Eau Douce and the north, and 30 minutes running from Belle Mare down past Île aux Cerfs. It is the weaker-rated of the two at 4.3 from 176 reviews. Read that pairing honestly: the better flight is the one that may not show you the thing, and the one that shows you the thing is rated lower.

See availability and prices for the east-coast seaplane flight

There are two of them, on opposite coasts

This is the part nobody explains. The east-coast operator calls its subject the Eastern underwater waterfall in so many words, and one of its reviewers describes seeing “the small and big underwater waterfall” on the same flight.

The €1,350 helicopter tour flies a different route entirely: from the airport in the south-east, over the illusion, then across the Chamarel coloured earths and waterfalls and along the south coast, with the Black River Gorges and Grand Bassin on its sightseeing list. That is the south-west of the island.

So “the underwater waterfall” is not one place with one flight path. If you have a particular photograph in your head, the question to put to the operator before paying is which one it flies over, and from where.

See availability and prices for the helicopter tour of the illusion

The minutes you buy include taxiing

One operator states something the other does not, and it applies to both: flight duration is measured from engine start to engine stop, which includes taxiing, take-off and landing procedures.

On a 15-minute seaplane flight that is a material share of what you paid for. If the view is the point, the 30-minute option is better value per minute in the air than the arithmetic suggests — not because the price per minute changes, but because the fixed overhead is the same either way.

Both seaplane operators also ask you to arrive at least 30 minutes before departure, and both state that flights depend on the weather and may be rescheduled.

The weight limit, and who is turned away

105 kg. Both seaplane operators publish it, and one of them also lists people over 230 lbs — that is 104 kg — among those it cannot take. The two numbers on the same page differ by a kilogram; treat 104 as the working figure and ask if you are near it. This is an aircraft limit, not a judgement, and it is not negotiable at the dock.

Pregnant women are listed as unsuitable on the second seaplane and on the €1,350 helicopter.

Bring your passport for the helicopter flight from the airport, and expect the full 30-minute check-in.

See availability and prices for the three-hour helicopter flight

When not to spend this money

If the weather is uncertain and you are leaving soon. Every one of these depends on conditions and reserves the right to reschedule. A flight booked for your last morning is a flight you may simply lose.

If 15 minutes is all your budget stretches to. A quarter of an hour that includes taxiing is a very short experience for €215, and the same money buys a whole day on the water with lunch — the catamaran and island trips start at a fraction of it.

If what you want is the coloured earths rather than the coastline. You can stand in front of them for a ticket price that is a rounding error next to a helicopter, and drive the south-west around them in a day.

Which one to book

For most people: the €220 east-coast seaplane, with the 30-minute option if you can stretch to it. It names the illusion, it flies three defined routes, and it is the most-booked flight here at 176 reviews. Its 4.2 rating is the lowest of the four, and that is the trade you are making.

See availability and prices for the east-coast seaplane flight

For the better-rated flight, if the waterfall is not the point: the €215 seaplane at 4.5 stars from 157 reviews. Go for the lagoon and the reef and you will not be disappointed.

For a proper excursion rather than a flypast: the €768.74 helicopter trip — three hours including hotel transfers, 4.6 stars from 103 reviews.

The €1,350 flight is for one kind of traveller only: someone who wants the south-western route, Chamarel from the air, and forty minutes rather than fifteen. Five reviews, all of them five stars — too few to lean on, and a lot of money to find out.