Lencois maranhenses dunes pools

Crystal-clear lagoons among white sand dunes form one of Brazil's most stunning landscapes, the Lençóis Maranhenses.

About this subject

The Lençóis Maranhenses, located in the state of Maranhão, northeastern Brazil, is a national park that hosts a unique natural phenomenon in the world. During the first half of the year, heavy rains fill the depressions between the dunes, creating thousands of temporary crystal-clear freshwater lagoons. The landscape spans approximately 1550 km² of protected area, with dunes reaching up to 40 meters in height. Unlike a desert, the region receives annual rainfall of up to 1600 mm, which allows the formation of these natural pools. The most famous lagoons, such as Lagoa Azul and Lagoa Bonita, attract visitors from around the world between May and September, when the waters are at their clearest. Water temperature ranges from 24°C to 28°C, making swimming a refreshing experience under the equatorial sun. The local ecosystem is fragile and harbors adapted species, such as the annual fish (which survives drought by burying its eggs) and migratory birds. The region is also known for its strong winds, which constantly sculpt the dunes and slowly move them. The main access is via the town of Barreirinhas, about 250 km from São Luís, the state capital. The park was created in 1981 and is a Brazilian natural heritage site, currently a candidate for UNESCO World Heritage status.

Frequently Asked Questions

What is the best time to visit Lençóis Maranhenses?

The best time is between May and September, when the lagoons are full and the water is crystal clear. Avoid the dry months (October to December) when many lagoons disappear.

Is Lençóis Maranhenses a desert?

No, technically it is a dune field with high rainfall. The rains form temporary lagoons, which distinguishes it from arid deserts.

How to get to Lençóis Maranhenses from São Luís?

By car or bus via BR-135 and MA-402 to Barreirinhas (about 4 hours). From there, you need to book 4x4 or boat tours to access the park.