🇧🇷 Brazil · Northeast
The Lençóis Maranhenses are one of the most improbable landscapes on the planet: a field of brilliant white sand dunes, the largest in South America, stretching for dozens of kilometres along the coast of the state of Maranhão, in the Northeast of Brazil. What makes it unique in the world is that, unlike a true desert, it rains here, and a lot: the rainwater gathers in the hollows between the dunes and forms thousands of freshwater lagoons of an incredible turquoise. The result is a sea of white dunes studded with mirrors of crystalline water, which from the air looks literally like a pile of sheets (lençóis, in Portuguese) spread out over the ground.
The big thing to understand before you travel is that this landscape is seasonal. The lagoons aren't permanent: they fill with the rains of the southern summer and evaporate in the dry season. That's why the time of year changes everything. Between July and September the lagoons are full and form that postcard scene of white sand and turquoise water; towards the end of the year, by contrast, many shrink or dry up and the place looks more like a desert of pure sand. Knowing this is the difference between an unforgettable trip and a small disappointment.
The classic base is Barreirinhas, a town on the bank of the Río Preguiças from where the 4x4 trips head out to the dunes and the most famous lagoons (Lagoa Azul, Lagoa Bonita) and the beautiful, navigable boat trip along the Preguiças to the sea. Anyone after something quieter and rougher chooses Atins, a fishing village with sand streets near the river mouth, which has become a kitesurfing mecca; or Santo Amaro do Maranhão, the western gateway, famous for having some of the loveliest and least crowded lagoons in the park. In 2024 the Lençóis were inscribed as a UNESCO World Heritage Site, recognition of a landscape without equal.
The Lençóis Maranhenses are a geologically young formation in terms of their present shape: the great dune field has been built up over the last few millennia. The sand reaches the coast carried by the region's rivers —above all the Preguiças and the Parnaíba—, is deposited on the shore and, during the dry season, is pushed inland by the steady ocean winds, forming chains of dunes that can reach 40 metres high and advance year on year. In the rainy season, water gathers in the hollows between the dunes over a barely permeable substrate, forming the thousands of lagoons the place is famous for; the name 'Lençóis' comes precisely from how the whole thing looks from above, recalling white sheets spread out. The Maranhão coast was inhabited by Indigenous peoples long before the Europeans arrived, and the region was later a stage for the Portuguese and French colonization of the Northeast (São Luís, the capital, was founded by the French in 1612). Small communities of fishermen and farmers settled in and around the sands —some still live in oases inside the park, such as Queimada dos Britos and Baixa Grande—. The Parque Nacional dos Lençóis Maranhenses was created by decree in 1981 to protect this unique environment and is administered today by ICMBio. In July 2024 the World Heritage Committee, meeting in New Delhi, inscribed the Lençóis Maranhenses on the UNESCO World Heritage list for their exceptional natural beauty and their geomorphological features; the certificate was officially handed over in 2025. The full story is on our history page.
Read the full history ↓The state where the Northeast meets Amazonia: a land founded by the French, with the only Brazilian capital of French origin —São Luís, a World Heritage Site— and the deserts of dunes and lagoons of the Lençóis Maranhenses.
Read the history of Maranhão →No exact prices: a scale from $ (budget) to $$$$$ (luxury), with 2-3 options per category.
Origins, formation and what the sources say.
The first surprise about the Lençóis Maranhenses is that, despite looking like the Sahara, they are not a desert in the strict sense: in a true desert it barely rains, whereas here heavy rain falls for much of the year. That paradox —an immense field of white sand dunes that floods seasonally and fills with freshwater lagoons— is exactly what makes this landscape unique in the world and what earned it, in 2024, inscription as a UNESCO World Heritage Site for its geomorphological value and its exceptional natural beauty.
The basic ingredient is sand, and its origin lies in the rivers. The region's watercourses —especially the Río Preguiças and, on a larger scale, the Parnaíba— carry sediment from the interior down to the coast and deposit it on the shore. Waves and sea currents spread that sand along the beach, and that's where the wind comes in: during the dry season, the steady winds blowing from the ocean towards the continent lift the sand off the coast and push it inland, kilometre after kilometre, shaping chains of dunes that can reach several dozen metres in height and that shift slowly year after year. That is how, over millennia, the largest dune field in South America was built, stretching for more than a thousand square kilometres along the Maranhão coast.
The other half of the miracle is the water. Beneath the sand of the dunes there is a barely permeable substrate, and during the rainy season (running roughly from January to June) rainwater gathers in the hollows between the dunes, where it can't drain away quickly, forming thousands of lagoons of clean fresh water. The figure usually cited is tens of thousands of lagoons across the park as a whole. Those lagoons reach their highest level between June and September —the postcard season— and then, as the rain stops and evaporation rises, they gradually drop until many dry up completely towards the end of the year. It's a cycle repeated every season: the same place is a sea of turquoise lagoons in August and a desert of almost pure sand in December.
The name 'Lençóis Maranhenses' is itself a description of the landscape. 'Lençóis' is the Portuguese word for 'sheets', and 'maranhenses' means 'of Maranhão', the state where they lie. The most widespread and accepted explanation of the name is purely visual: seen from above —from a high dune or, better still, from the air on a sightseeing flight—, the white, rippling, soft dunes recall a pile of linen sheets laid out or rumpled on the ground, stretching to the horizon. It's one of those rare occasions when a place name captures with poetic precision what you actually see.
The whiteness of the sand reinforces the image: unlike many deserts of golden or reddish tones, the sand of the Lençóis is remarkably pale, almost white, which from a distance heightens the resemblance to bedding drying in the sun. Combined with the turquoise blue of the lagoons in the water season, the whole produces the colour contrast that became the place's trademark.
The place name became popular over time among locals and travellers, and was officially enshrined when, in 1981, the protected area was named Parque Nacional dos Lençóis Maranhenses. It's worth noting that 'Maranhão', the state's name, has its own origin —tied to the first colonial names for the northern coast of Brazil—, but the distinctive and famous part of the park's name is that 'Lençóis' which evokes, in a single word, the whole landscape.
Long before the Europeans arrived, the coast of Maranhão was inhabited by Indigenous peoples, most of them of Tupi stock, who lived off fishing, hunting, gathering and farming adapted to an environment of dunes, rivers, mangroves and restinga. For those communities, the dune field and its seasonal lagoons were part of a territory they knew and used according to the rhythm of the water: when the lagoons filled, there was fishing and there were resources; when they dried, the landscape changed completely. The Indigenous imprint survives to this day in the region's place names, in many names of Tupi origin and in much of the material and culinary culture of the Maranhão Northeast.
European colonization of this stretch of Brazil had a singular chapter: São Luís, today the state capital and the main gateway to the Lençóis, was founded by the French in 1612 —it is the only Brazilian capital founded by the French— and shortly afterwards passed into Portuguese hands. Over the colonial centuries, the Maranhão coast was settled by a mix of Indigenous, Portuguese and African roots (the region had a significant enslaved population brought in for agricultural work), a triple inheritance clearly visible in Maranhão culture, from the festivals to the cooking —the emblematic arroz de cuxá, with its vinagreira of African origin, is a good example of that crossing.
In the sand field itself and along its edges, settlement was always sparse and scattered, made up of small communities of fishermen and subsistence farmers who settled in the oases and along the riverbanks. Some of those communities still exist, even within the limits of the present-day national park, and they are living testimony to a way of inhabiting this extreme landscape that long predates tourism.
Formal recognition of the value of the Lençóis came in 1981. On 2 June that year, by decree, the Parque Nacional dos Lençóis Maranhenses was created, with the aim of protecting this unique ecosystem of shifting dunes, seasonal lagoons and restinga, sitting in a transition zone between three great Brazilian biomes (Cerrado, Caatinga and Amazon). The park covers around 155,000-156,000 hectares on the eastern coast of Maranhão, spread mainly between the municipalities of Barreirinhas, Santo Amaro do Maranhão and Primeira Cruz.
The park is managed today by ICMBio (Instituto Chico Mendes de Conservação da Biodiversidade), the Brazilian federal body responsible for conservation units. Administering such a particular area brings its own challenges: regulating access to the dunes (hence the requirement to enter with 4x4 vehicles and authorized drivers, not on your own), reconciling conservation with tourism that grows year on year, and caring for the communities living inside and around the park. In 2024 the Lençóis received around 440,000 visitors, which made it one of the most visited national parks in Brazil, and that success makes organizing the visit all the more necessary.
An interesting detail of its recent management is the recognition of the population living in the park: a survey carried out between 2023 and 2024 recorded dozens of settlements and around 1,500 families within the park's limits, which shows this is not an empty territory but an inhabited landscape, where conservation has to coexist with traditional ways of life.
In 2024, the Lençóis Maranhenses achieved the highest international recognition for a natural site: inscription on the UNESCO World Heritage List. The decision was taken at the World Heritage Committee meeting held in New Delhi, India, in July 2024, when the Parque Nacional dos Lençóis Maranhenses was inscribed as a natural property on the strength of its exceptional beauty and its unique geomorphological features: an active dune field, interspersed with freshwater lagoons of rainwater origin, shaped by the wind, with no equivalent in the world.
ICMBio, the Ministry of the Environment and Brazilian institutions celebrated the title as a milestone for conservation and for tourism in the Northeast. The official handover of the World Natural Heritage certificate took place at a later ceremony, in 2025. The recognition places the Lençóis alongside other natural sites of world standing and reinforces the commitment to protect a landscape as fragile as it is spectacular, where the balance between sand, wind and water can be affected both by climate change and by tourist pressure.
Beyond the prestige, the title brings responsibilities: UNESCO expects inscribed sites to have robust management plans, control over visitor numbers and effective protection of the values that justified the inscription. For a park that passed 440,000 visitors in 2024, the World Heritage seal is at once a tourist magnet and a reminder that conservation has to keep pace with the growth.
Though it may look like uninhabited territory, the interior and the edges of the Lençóis are dotted with small communities that have lived there since long before tourism arrived. The best known are the oases of Queimada dos Britos and Baixa Grande, in the very heart of the sands: villages of a handful of families —a few dozen people in all— who live in houses of mud and palm thatch, off fishing, small crops, raising animals and, increasingly, hosting the walkers who cross the park on foot. These communities are one of the great draws of the 'travessia', the multi-day trek linking Atins or Santo Amaro across the dunes, sleeping in redes (hammocks) in these oases. Atins, at the mouth of the Preguiças, is both the gateway to that trek and a fishing community turned kitesurfing destination.
Tourism transformed the economy of the whole region. In a few decades Barreirinhas went from a quiet town to the main tourist hub, with hotels, pousadas, restaurants and agencies; Santo Amaro and Atins grew at their own pace. The challenge, now more than ever after the UNESCO title, is for that growth to benefit the local communities without degrading the landscape or displacing those who have always lived there.
And one curiosity that sums up the magic of the place: there are fish in the lagoons of the Lençóis. It seems impossible —if the lagoons dry up every year, how do the fish survive until the next rainy season?—, but nature found a way. Some species, like the traíra, bury themselves in the damp mud of the bottom when the lagoon dries and enter a kind of dormancy until the water returns; others are 'annual' fish that die when the lagoon dries but leave resistant eggs buried in the sediment, ready to hatch with the first rains. So every year, when the lagoons are reborn, the fish 'reappear' as if by magic. It's the same seasonal cycle of life and death that governs the whole landscape, written this time in the key of fauna.