Lençóis Maranhenses

The Dunes Fill with Clear Blue Lagoons After the Rainy Season

Lencois Maranhenses looks impossible in photographs: a vast field of white sand dunes, rolling like a frozen sea, each valley between dunes holding a pool of clear freshwater ranging from pale green to deep cobalt. The photographs are accurate. The explanation is geological rather than miraculous: the park receives heavy rainfall from January through June, the underlying rock is impermeable, so rainwater collects between dunes and stays there until the dry season evaporates it. No aquifer, no drainage, just water sitting in 1,500 square kilometres of white quartz sand.

The lagoons appear between July and September at maximum capacity, diminish through October, and are largely gone by December. The park exists year-round as a dune landscape, but the reason to make the trip to Maranhao state in northeastern Brazil is those temporary blue pools, and the timing of your visit determines what you find.

Getting There

Fly to Sao Luis, the state capital, from Brasilia, Sao Paulo, or Fortaleza. From Sao Luis, the main access town is Barreirinhas, 260 kilometres east – 4 hours by shared van or private car on a road that deteriorates toward the end. Regular buses exist but take 6 hours. Direct flights from Sao Luis to Barreirinhas’s small airstrip take 45 minutes and cost around BRL 400-600 each way; convenient if you’re planning a short visit.

Atins, a smaller village accessible by speedboat from Barreirinhas (1.5 hours, BRL 50-80 per person), is the better base for accessing the most scenic sections of the park. Atins has no paved roads and no cars. The combination of boat access, minimal infrastructure, and the dunes a short walk from the door makes it the more memorable place to stay.

Inside the Park

Guided 4WD buggy tours are the standard way to reach the lagoons: the buggies navigate loose sand that no other vehicle can handle reliably. Half-day circuits cost BRL 150-250 per person and cover Lagoa Azul and Lagoa Bonita, the classic viewpoints. Full-day circuits add Lagoa do Paraiso and take you further into the park. A competent guide knows which lagoons will have the clearest water on a given day, which varies with sun angle and wind.

The lagoon water is clean enough to swim in – it has been tested repeatedly given the volume of questions from visitors – and swimming in crystal freshwater between white sand dunes under a strong Brazilian sun is as good an experience as it sounds. There are no facilities inside the park. Bring water (the irony of dehydrating next to fresh water is well documented), sunscreen, and food for full-day excursions. The midday sun on white sand is severe.

July and August are peak season – maximum water levels, most tourists. June and September are shoulder season and still have excellent lagoon coverage with noticeably fewer people. October onward the smaller lagoons dry out quickly.

Staying and Eating

Barreirinhas has the widest accommodation range: pousadas from BRL 150-200 per night budget, up to BRL 400-600 at better options. Pousada Encantes do Nordeste on the main waterfront road is consistently recommended for its location and value.

In Atins, Vila Mandala has comfortable bungalows from around BRL 350 per night and serves grilled fish from the local catch. Book ahead for July-August; out of season you can often arrive and find space.

The restaurants along the Rio Preguicas waterfront in Barreirinhas all serve similar menus: grilled fish, moqueca (fish stew in coconut milk), rice, and feijao at BRL 40-70 per plate. The fish is fresh. The setting of the waterfront in the late afternoon with the light going orange across the river is as pleasant as the food. Bar Atins in the village of Atins is the social centre – cold beer, a hammock terrace overlooking the sand, and the company of other travellers who found their way to a very remote corner of Brazil.