Situated in the Indian Ocean, approximately 1,200 miles southeast of Africa, lies the gorgeous island nation of Mauritius. This picturesque country is known for its beautiful beaches, lush landscapes, and vibrant culture.
Mauritius is also home to one of the most captivating natural wonders on Earth- the Mauritius Underwater Waterfall. Despite its name, this phenomenon isn’t actually a waterfall in the traditional sense.
A stroll along the southwestern coast will reveal a startling, dramatic site amidst its tropical, turquoise coastal waters.
Half the fun of travel is witnessing awe-inspiring geographical features - especially when they're sights you can't see anywhere else in the world. One such spectacular natural wonder can be found just off the coast of Africa, near the tropical island paradise of Mauritius in the Indian Ocean.
Let’s delve into the science and geological history behind this fascinating optical illusion.
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The Geological Origins of Mauritius
Some 700 miles east of Madagascar, situated on a submarine plateau in the Indian Ocean, sits the island nation of Mauritius, which was formed by volcanic activity some 8 million years ago. As with other islands in the surrounding archipelago, Mauritius was formed through volcanic activity. The extreme and uneven lay of the land in this region is the result of volcanic activity which gave rise to Mauritius around 8 million years ago.
Being a volcanic hotspot, the plateau saw enormous underwater eruptions that spewed magma through the continental crust of Mauritia, and it was this magma that solidified to form the Mascarene Islands.
The Republic of Mauritius is an island nation approximately 1,200 miles southeast of Africa. The island’s underwater waterfall is located off its southwest shores, near the Le Morne Peninsula.
The islands - known as the Mascarene Islands (or Îles Mascareignes) - sit on a submarine plateau, also known as an ocean shelf. The shelf is no deeper than 150 metres below sea level, but its drop-off plunges to depths of over 4000 metres.
Interestingly, evidence of Mauritius’s birth through Mauritia can be found in the form of minerals in its white sandy beaches. Known as zircons, grains of the super-tough material (which is associated with continental crust) were found to be up to 2 billion years old.
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The entire southern half of the Mascarene Plateau is one of the newest major features on our planet, having only been created over the most recent few million years. The emergence of lava from the bottom of the seafloor created all of the Mascarene Islands in the geological blink-of-an-eye.
Mauritius, where this unusual “underwater waterfall” exists, was created about 8 million years ago, and is the second-largest of the Mascarene Islands.
The Illusion Explained
While the coastal shelf does indeed drop off to a depth of 4,000 meters, this underwater waterfall is an optical illusion caused by erosion. Despite being an optical illusion, the faux waterfall is still stunning. It’s difficult to see this stunning underwater waterfall from the shore.
To truly see what appears to be the flowing water, you need to be above the water, looking down.
How did the underwater waterfall in Mauritius come to be? Mauritius is a volcanic island that rises from the ocean floor. Along the southern coast of the island, there is a gradual slope that leads out to a sudden 2.5-mile drop all the way to the ocean floor.
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The “waterfall” is actually an optical illusion formed by sand and silt deposits sliding down the slope and then dropping into the abyss. As ocean currents move around the drop-off, sand and silt deposits along the coastal shelves spill off the edge of the underwater plateau, cascading down the steep drop-off.
This dramatic visual is an optical illusion of the unique and naturally forming oceanic topography. The site's sudden drop-off, combined with the varying sunlight penetration levels, creates a gradient from light to dark blue, resembling a cascading waterfall.
As ocean currents move sand and other sedimentary particles over the edge of the shelf, it creates a streaming effect that looks like water rushing over a cliff’s edge. Adding to this mirage are sand and silt particles carried by powerful underwater currents. As these particles descend into the depths of the plateau, they enhance the effect, creating an appearance of water rushing downward.
Of course, the underwater waterfall is not actually a waterfall, as water cannot fall through water. Instead, there’s:no significant temperature gradient,no continuous flow of water from higher depths to lower depths,and no situation where multiple sources of water are meeting.
The surprising culprit, and the cause of this striking phenomenon? It’s sand. What’s driving Mauritius’s amazing underwater waterfall is something else entirely.
That’s right: what’s happening is nothing more complicated than erosion, the same process where flowing water and air weather away the coastal regions, grinding a solid land mass into tiny, grain-sides fragments. The volcanically formed island of Mauritius has copious amounts of sand on its coast, and ocean currents move that sand back-and-forth over the shallow shelves that border the island.
However, where the shallow shelves that are part of this submarine plateau end, there are only deeper, bluer, darker waters. And when the ocean currents drive that coastal sand off of the southern tip of Mauritius and into the deep ocean waters, what appears to be an “underwater waterfall” is actually the result of sands sinking through the deep water, down to the bottom of the ocean.
Even so, the underwater waterfall off the southern coast of Mauritius is truly a one-of-a-kind phenomenon, as the erosion that’s occurring is particularly directional.
Breathtaking Mauritius Helicopter Tour | Underwater Waterfall | Lot nad Mauritiusem Kasi i Bartka
How to View the Underwater Waterfall
If you are interested in visiting this natural wonder, you’ll have to take to the skies, as the attraction is best viewed from above the water’s surface. The most astounding view is aerial, however, and helicopter sightseeing tours are easy to book.
The best way to view this phenomenon is from an elevated perspective. You can hike to the summit of Le Morne Brabant, take a helicopter ride, or book a private seaplane flight.
From land, the best vantage point can be found at the top of Le Morne Brabant, a 500-meter peak. You can see a very rough shape of the waterfall by hiking up Le Morne Brabant. The only way to see the exact formation of the underwater waterfall, though, is to fly over it.
Helicopter sightseeing tours can whisk you high above this natural phenomenon - take to the skies for a bird’s-eye view of Le Morne Peninsula and the sparkling lagoon, and for the chance to try and get your head around the incredible power of nature.
Other Attractions in Mauritius
In addition to the Mauritius Underwater Waterfall, there are several other fun things to do and places to explore in Mauritius. Seeing the dramatic underwater waterfall inspires travelers to explore the other epic natural sites that Mauritius has to offer.
The country boasts a wide array of luxurious resorts and spas where travelers can relax and unwind with a spectacular view of the beach.
If you’re looking for adventure, you can check out the Le Morne Cultural Landscape, which is a UNESCO World Heritage Site containing a large basaltic monolith with a summit of 1,824 feet. Nearby, the Le Morne Peninsula is home to the Le Morne Brabant, a UNESCO World Heritage Site. Towering over 1,600 feet above its surroundings, the mountain offers a challenging but rewarding 4.1-mile hiking trail with panoramic views of the ocean, beaches, and tropical jungle surroundings. Hiring a guide provides deeper insight into the area's history, particularly its connection to slavery.
Finally, no trip to Mauritius would be complete without visiting the 17,000-acre Black River Gorges National Park, made up of “rolling hills, deep valleys, spectacular waterfalls, and unparalleled beauty of flora and fauna.” Another must-see natural site nearby is Black River Gorges National Park, located in the island's inland hills. With over 30 miles of trails through rainforest, gorges, and valleys, the park is home to impressive sights like Alexandra Falls and Black River Peak, the island's highest point.
While visiting the park, you can visit Alexandra Waterfall and even hike to Black River Peak - the island’s highest point. Birdwatchers can spot endemic species such as Mauritius kestrels, echo parakeets, and pink pigeons, while plant enthusiasts will appreciate the park's orchids and lush foliage.
Hidden among the lush tropical terrain are some breathtakingly beautiful waterfalls. Often found in serene, isolated parts of the island, trekking to see the waterfalls is a perfect way to reconnect with nature, breathe fresh air, and surrender to a sense of calm and inner peace.
Mauritius offers an idyllic, budget-friendly tropical vacation, and it is also home to endless natural delights. From coral reefs to diverse plants and wildlife, one of the island's most stunning sights is what appears to be a breathtaking underwater waterfall. Known for its pristine white-sand beaches and reputation as an affordable tropical vacation destination, Mauritius has as much to offer beneath the ocean's surface as it does on land.
Best Time to Visit
If you want to enjoy the iconic Mauritius Underwater Waterfall, then the best time to book your trip is from the months of May to December. These months coincide with the island’s dry and cooler season with lower humidity levels and minimal rainfall, making it ideal for outdoor activities.
Safety and Travel Information
Mauritian borders have been open again since Mauritius lifted its COVID-19 entry requirements on 1 July 2022. Travelers, whether vaccinated or not, no longer need to take a test or self-isolate on arrival. Their Ministry of Health may ask for your blood sample either upon your arrival at the airport or at a later stage during your stay if you have traveled from a country where malaria is common.
With crime levels being low, Mauritius is a safe place for tourists. However, petty crime does occur, including pickpocketing and bag snatching. Walking alone after dark or using ATMs on the streets is not recommended. Banks, hotels, or shops are safe locations to withdraw cash. Also, make sure not to get conned over accommodation.
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