Parque Nacional dos Lencois Maranhenses where dunes hold rainwater
Published on 09/24/2026 at 00:43 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Parque Nacional dos Lencois Maranhenses is a coastal landscape of white sand dunes and freshwater lagoons in MaranhĂŁo, north-eastern Brazil. The park extends along an 80 km coastline, with the town of Barreirinhas among its principal gateways. Sand and rainwater form the visible pattern: long dune chains rise beside pools whose colours, depths and outlines vary across the seasons.
Parque Nacional dos Lencois Maranhenses: a coast drawn in sand
The national park covers 156,562 hectares in a transition zone between the Cerrado, Caatinga and Amazon biomes. About 90,000 hectares consist of dune fields with temporary and permanent lagoons, while restinga, mangroves, rivers and marine environments complete the protected landscape. The UNESCO World Heritage listing records the park’s coastal dunes and lagoons as a major geological and geomorphological landscape.
The sand forms barchan dunes, shaped into curved chains by prevailing winds. These chains can extend for tens of kilometres, with dunes reaching up to 30 m (98 ft) as they move inland. The coastline combines beaches, plains and the dune field, creating a broad transition between Atlantic water and inland habitats.
Rainwater between the dunes
Parque Nacional dos Lencois Maranhenses resembles a desert from a distance, yet its lagoons are filled by rainfall. During the rainy season, water gathers in depressions between the dunes, producing temporary freshwater pools beside permanent lagoons. Their colours range from pale blue to green, with each pool occupying a separate basin in the sand.
The lagoons have no inlet or outlet and are fed by rainwater. Their presence changes with the water table and the seasonal rainfall pattern. The shifting lagoon landscape is part of a wider coastal process in which mobile dunes and temporary water bodies occupy the same terrain.
The park’s natural setting includes pioneer vegetation, restinga and mangroves. These habitats meet freshwater and marine environments across the Barreirinhas Basin. The result is not a bare sand field, but a protected coastal system where dunes, lagoons, vegetation and shoreline form connected parts of one landscape.
A national park with a recorded geological history
Parque Nacional dos Lencois Maranhenses was created by Decree 86,060 on 2 June 1981. Its protected area lies in Maranhão, on Brazil’s north-eastern coast, and includes territory associated with Barreirinhas, Santo Amaro and Primeira Cruz. The park’s 1981 legal foundation remains part of its formal identity.
The dunes belong to a coastal system shaped during the Quaternary period. Marine sediments, coastal movement and wind action produced fixed and mobile dunes across the basin. The barchans retain evidence of this geological development in their repeated forms and directional chains.
UNESCO inscribed the property on the World Heritage List in 2024. The designation covers the dune field, lagoons, coastline and associated ecosystems. It places the park’s landscape within an international framework of natural heritage while retaining its character as a Brazilian protected area.
Visiting Parque Nacional dos Lencois Maranhenses: what travellers from Western Europe should know
- Barreirinhas lies inland from the Atlantic coast and functions as a principal gateway to the park. Access from the town includes sand-capable vehicles and routes connected with the Preguiças River.
- The terrain consists of loose white sand, mobile dunes and depressions filled by lagoons. Walking routes cross exposed dune surfaces and can include steep rises and descents.
- The park spans three municipalities: Barreirinhas, Santo Amaro and Primeira Cruz. The wider access area also includes coastal communities and river settlements.
- 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?
The park is on the east coast of MaranhĂŁo in north-eastern Brazil. Barreirinhas is a principal gateway town, with Santo Amaro and Primeira Cruz also within the protected area.
What can visitors expect in the park?
Visitors encounter white dunes, exposed sand, freshwater lagoons, coastal plains, restinga and mangrove habitats. Routes across the terrain involve walking on loose sand and crossing dune slopes.
What makes the landscape distinctive?
Rainwater lagoons occupy basins between mobile and fixed dunes along an Atlantic coastline. The combination of moving sand, seasonal freshwater and coastal ecosystems gives the park its recognisable form.
