Parque Nacional dos Lencois Maranhenses: dunes, lagoons and shifting light
Published on 09/09/2026 at 08:35 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Parque Nacional dos Lencois Maranhenses in Maranhão, north-eastern Brazil, is a protected landscape where long bands of pale sand are cut by clear freshwater lagoons. Established as a national park in 1981, it covers over 150,000 hectares of dunes, beaches and coastal wetlands in a transition zone between the Cerrado, Caatinga and Amazon biomes, with Barreirinhas as one of its main gateways.
A dune field that behaves like a desert by the sea
Parque Nacional dos Lencois Maranhenses occupies part of the eastern coast of Maranhão, with its protected area running inland from the Atlantic shore and covering several municipalities including Barreirinhas, Santo Amaro and Primeira Cruz.the park covers three municipalities Although it looks at first glance like an inland desert, the dune field sits directly behind a strip of beach and a flat coastal plain, and is shaped by marine winds and sand carried from offshore banks.
The park’s protected area is cited as around 155,000 to 156,000 hectares, making it one of the largest continuous coastal dune systems in South America.an expanse of dunes stretching along the coast Within this area, broad ridges of loose, white sand run for kilometres, separated by shallow basins where water can collect. The dunes shift under the action of prevailing winds, but the overall banded pattern remains recognisable when viewed from the air.
Rain-fed lagoons between the dunes
Between the dune ridges, interdune depressions form natural basins that fill with freshwater when seasonal rain falls across the park. As rainwater soaks into the sand and meets less permeable layers beneath, temporary and semi-permanent lagoons appear in the hollows, creating thousands of pools with gently sloping sandy margins.freshwater lagoons trapped between dunes by compact sediments The lagoons vary in depth, size and colour, with some showing clear turquoise tones and others a deeper blue or green depending on mineral content and algae.
Hydrologists describe how the combination of sand and finer sediments in the park’s soil helps retain water near the surface, prolonging the life of these pools beyond the immediate wet months.a mixture of sand and clay contributes to water retention In some lagoons, small fish and other aquatic species appear, carried in as eggs or larvae during floods from nearby rivers or through underground connections, turning the dune hollows into temporary habitats framed by bare sand.
A protected landscape with global recognition
The Brazilian federal government created Parque Nacional dos Lencois Maranhenses by decree on 2 June 1981, designating it as an integral protection conservation unit under national law.the park was established by decree in 1981 Management is carried out by the Chico Mendes Institute for Biodiversity Conservation (ICMBio), which oversees conservation measures for the dune field, coastal wetlands, mangroves and associated fauna.
Internationally, the park has been recognised for the way its dune and lagoon system reflects the interaction of coastal winds, tides and tropical rainfall. UNESCO has inscribed Lençóis Maranhenses National Park on the World Heritage List, citing its extensive white dune field and seasonal freshwater lagoons as central to its outstanding value.a World Heritage Site with over 156,000 ha of dunes and lagoons The park’s location at the meeting point of three major Brazilian biomes brings together species and ecosystems from different regions, including mangroves along tidal channels, restinga vegetation on sandy soils and elements of inland savanna and scrub.
Visiting Parque Nacional dos Lencois Maranhenses: what travellers from Western Europe should know
- Parque Nacional dos Lencois Maranhenses lies on the eastern coast of Maranhão in northern Brazil, with Barreirinhas serving as a principal access town reached overland from São Luís.
- Travel within the park involves moving over soft sand and dune slopes, often on foot or in off-road vehicles, and reaching the lagoons requires walking across uneven terrain.
- The park’s climate is tropical, and exposed dune areas lack shade, so time spent on the sand involves direct sun and reflective glare from the pale surface.
- The official language is Portuguese and the currency is the Brazilian real.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
Searching for Parque Nacional dos Lencois Maranhenses on social platforms
These links open searches for Parque Nacional dos Lencois Maranhenses on each platform.Frequently asked questions about Parque Nacional dos Lencois Maranhenses
Where is Parque Nacional dos Lencois Maranhenses located?
Parque Nacional dos Lencois Maranhenses is in Maranhão state on Brazil’s north-eastern coast, with Barreirinhas, Santo Amaro and Primeira Cruz providing access points.
What should visitors expect on a visit?
Visitors encounter extensive white sand dunes, seasonal freshwater lagoons and stretches of Atlantic beach, reached by off-road vehicles and walking across soft, uneven sand.
What makes Parque Nacional dos Lencois Maranhenses distinctive?
The park combines a large coastal dune field with rain-fed lagoons and sits at the junction of several Brazilian biomes, creating a rare mix of desert-like sand and aquatic habitats.
