Lençóis Maranhenses by Car: A Route Through Maranhão

Maranhão holds one of the most improbable landscapes in Brazil. In the middle of the Northeast, where a dry climate dominates much of the year, there is a national park where white sand dunes sit alongside freshwater lagoons of blue and green. The dunes look like bedsheets spread across the ground, hence the name. The lagoons appear among them after the rains and turn what would be just desert into something with no equivalent on the planet.

The Lençóis Maranhenses are in the state of Maranhão, in northern Brazil, and were recognized as a UNESCO World Heritage Site in 2024. Getting there by car, passing through São Luís before heading into the Maranhão backcountry to Barreirinhas, is a route that already prepares the traveler for what lies ahead: a Brazil different from anything that was on the map before. It is one of the destinations that appears most on the list of overland routes across Brazil.

In short: the route leaves São Luís, the capital of Maranhão, and covers about 260 km on the BR-135 to Barreirinhas, the gateway to Lençóis Maranhenses National Park. From Barreirinhas depart the 4x4 vehicle and boat trips through the lagoons, dunes and along the Rio Preguiças to the remote village of Atins. The best time is between July and September, when the lagoons are full and the dunes are at their whitest.

São Luís: worth stopping before you continue

São Luís is the only Brazilian capital founded by the French and has a historic center protected by UNESCO since 1997. The Portuguese azulejo tiles covering the facades of the colonial townhouses, many of them in slow restoration and others already well preserved, create an urban texture that appears in no other city in the country.

The city deserves at least one night before you continue to the Lençóis. The historic center is compact and can be covered on foot. Maranhão cuisine, especially arroz de cuxá, shrimp pie and the salt cod fritters at the market, is a must-do part of the experience before heading into the interior of the state.

São Luís has an airport with flights from several capitals, which makes it the natural entry point for those who fly to Maranhão and pick up a rental car to continue to Barreirinhas.

The road to Barreirinhas

From São Luís to Barreirinhas it is about 260 km on the BR-135 and MA-402, with a travel time of three to four hours depending on road conditions. The stretch is being improved in some places and the quality of the pavement can vary, so it is worth checking conditions before leaving, especially in the rainy season.

The scenery along the road is already part of the route. The interior of Maranhão has a vegetation of cerrado and restinga that keeps changing along the way, with carnauba palm windbreaks, low fields and small towns that have the pace and architecture of the Northeastern interior.

Barreirinhas is a mid-sized town with lodging, restaurants, a gas station and tour agencies. This is where everything is arranged to enter the park.

How the lagoons work and when to go

The lagoons of the Lençóis Maranhenses don't exist all year. They form between January and June, during Maranhão's rainy season, when rain collects between the dunes and can't drain because the compact sand soil below prevents quick infiltration. The result is hundreds of lagoons scattered across the park, each with a different shade of blue or green depending on the depth and the vegetation on the bottom.

The best time to visit is between July and September. The rains have already stopped, the lagoons are at maximum volume and the water is clean and blue. The dunes are white because the vegetation that grows in the rainy season has dried and the sand is back to its natural color. This is Maranhão at its best.

From October the lagoons begin to dry up. In December and January, with the rains returning, access inside the park can get difficult in some stretches. Those who go between May and June catch the lagoons full but with more cloud cover and a chance of rain during the trip.

Inside the park: the lagoons and the dunes

The interior of the National Park does not allow free circulation of private vehicles. The trips are made in 4x4 vehicles with accredited guides that depart from Barreirinhas and Santo Amaro do Maranhão. These vehicles have traction and tire pressure suited to sand, and the guides know the routes and the conditions of each lagoon.

Lagoa Azul is the most famous and most visited, with quick access from Barreirinhas. Lagoa Bonita lies deeper inland and is the preferred spot for sunset, with a panoramic view over the dunes that stretch to the horizon. Lagoa dos Peixinhos has its own ecosystem, with small fish that live in the isolated environment of the lagoons.

The full trip through the central part of the park usually lasts a whole day, leaving early in the morning and returning in the afternoon. For the more distant lagoons, the option of staying overnight inside the park or in Atins changes the experience.

Use GT Overlander to build your Lençóis route with the waypoints of the São Luís-Barreirinhas corridor. With the trip described in natural language, the AI organizes the stages and the support points on the road to the park.

Rio Preguiças and Atins

The Rio Preguiças rises in the interior of Maranhão and flows into the Atlantic passing through the national park. Making the boat trip from Barreirinhas to the mouth, with stops at Mandacaru, Caburé and Atins, is a second layer of the route that complements the dune trips.

Mandacaru has a lighthouse from which the view over the meeting of the river and the sea, with the dunes in the background, is one of the most open in the park. Caburé is a narrow strip of sand where the river and the sea meet, with fresh water on one side and salt water on the other on the same sandbank. Atins is a small, remote village at the edge of the park, reachable by boat or by 4x4 along the beach strip, with simple inns and an isolation that contrasts with the bustle of Barreirinhas.

From Atins the beach strip continues, linking Maranhão to Piauí and Ceará, the corridor that ends at Jericoacoara. It is the natural continuation for those with more days.

The full boat trip along the Rio Preguiças lasts a day. It is worth doing it separately from the lagoon trip so you don't try to squeeze everything into the same day.

Frequently asked questions

Do you need a 4x4 to visit the Lençóis Maranhenses?

To enter the interior of the park, yes. The trips are made in 4x4 vehicles hired locally in Barreirinhas. Your own car stays in town and the visitor goes with an accredited guide. To get to Barreirinhas from São Luís, a regular passenger car is enough in the dry season.

How much time should you allow for the route?

The minimum to see the essentials is three days in Barreirinhas: one day for the lagoon trip, one day for the Rio Preguiças trip and one day for arriving and leaving. With five days, you can include an overnight stay in Atins and explore the more distant lagoons.

Is the water in the lagoons clean enough to swim in?

Yes. The water in the lagoons is fresh, clean and without current. Swimming in the lagoons is one of the main activities of the park. The water temperature, even in the Maranhão winter, is pleasant. Some lagoons have depths ranging from knee-high to more than two meters depending on the spot.

Can you drive from São Luís to Barreirinhas in one day?

Yes, the distance allows it. It is worth leaving São Luís early to reach Barreirinhas with afternoon time left to arrange the next day's trips. The road in normal conditions has no major difficulties for a regular passenger car.

Do you have to hire a guide to enter the park?

For vehicle access to the interior of the park, an accredited guide is required by regulation. For walking trails around Barreirinhas, some stretches are freely accessible. Local agencies organize full trips with vehicle, guide and insurance included.

Wrapping up

The Lençóis Maranhenses are the destination that most defies description. Anyone who tries to explain what it is like to see a blue lagoon in the middle of white dunes hundreds of kilometers from the coast always gets the same answer: I can't believe this exists in Brazil. It does, it is in Maranhão, and the road there, passing through São Luís and the interior of the state, is already part of a trip that starts differently and ends with the wish you had stayed longer.