Lençóis Maranhenses

Lençóis Maranhenses is one of those places that feels like it shouldn’t exist. A field of white sand dunes in equatorial Brazil that fills every year with thousands of translucent blue and green lagoons: the dunes are pushed inland from the coast by trade winds, the rains come January through June and collect in the depressions where impermeable rock prevents drainage, and by July the water is warm, clear, and deep enough to swim in. By November it has mostly evaporated. The cycle happens reliably every year, and yet the place remains relatively un-overrun. Getting there takes effort, which is most of the reason.

There is no natural explanation for why the dunes don’t absorb the rainwater the way most desert dunes do. The impermeable layer under the sand prevents drainage, creating the lagoons that are unique to this specific geography. Scientists have confirmed the mechanism; the fact that it produces thousands of turquoise pools scattered between white sand dunes remains improbable regardless of explanation.

Getting There

The base town is Barreirinhas, 280 kilometres east of São Luís in the state of Maranhão. From São Luís (accessible by air from Rio de Janeiro, São Paulo, Brasília, and other major Brazilian cities), the road takes around 4 hours on a route that is mostly sealed. Shared vans leave irregularly from São Luís; it’s more reliable to arrange transport through your accommodation in advance.

The Lagoons

The jeep trips from Barreirinhas are rough: 4WD drives across sand, sometimes through shallow water, no shade on the dunes. Start early. Bring water, hat, and sun protection.

Lagoa Azul and Lagoa Bonita, accessible by 4WD from Barreirinhas (around 1.5 hours each way), are the most famous and fill on weekends. Lagoa Paraíso, outside the national park near Jijoca de Jericoacoara to the west, is quieter and arguably more beautiful. The less-famous lagoons in the park’s interior, reached only by longer routes, have the water entirely to yourself if you time it for weekdays.

Best timing: July is the sweet spot – lagoons are full, weather is clear, the landscape at its most surreal. May and June bring continuing rains and potentially impassable tracks. October and November see water levels dropping sharply.

Barreirinhas

The town is functional rather than charming, with a waterfront along the Rio Preguiças and restaurants serving grilled fish, rice, and pirão (a cassava gravy ubiquitous in Maranhão cooking). Restaurante do Paulinho near the port is reliable and unpretentious. Pousadas range from basic fan-cooled rooms at BRL 80-120 per night to air-conditioned options at BRL 200-300. Book ahead for July when demand peaks.

Atins

The village of Atins, at the eastern entrance to the park, is reached by 4WD or by boat down the Rio Preguiças (3 hours, pleasant trip through shifting channels). It’s smaller than Barreirinhas, has less infrastructure, and gives access to a different section of the dune field including remote lagoons that rarely see visitors. Worth the extra day if you have it.

The park currently has no entry fee, though this may change as visitor numbers continue to grow.