Lencois maranhenses dunes pools

Discover Barros Lagoons, the unique natural pools formation along the Maranhão coast

About this subject

Barros Lagoons, commonly called Maranhão Lencois, are a unique geographical formation on the coast of Maranhão. Located about 180 km from São Luís, these natural pools form where sandy dunes intersect with fresh and salt water, creating a singular ecosystem along the Brazilian coast. The formation occurs during the rainy season when the underground aquifer rises and fills the depressions between the dunes, while the sea floods the lower areas, creating a balanced mix of fresh and salt water. The landscape constantly transforms with the seasons. During the dry season, many of the pools dry up, while new ones form with the arrival of rainwater. The region was declared a natural heritage of humanity by Unesco in 1991 and is now one of the most sought-after destinations on the northeastern coast. Ecotourism has flourished in the area, but the challenges of preserving biodiversity and river systems in the region require continuous care.

Frequently Asked Questions

How are Barros Lagoons formed?

Barros Lagoons are formed from the interaction between fresh and salt water. During the rainy season, the underground aquifer rises, filling the depressions between the dunes, while the sea floods the lower areas, creating a balanced mix of fresh and salt water.

What is the best time to visit Barros Lagoons?

The best time to visit Barros Lagoons is between June and September, during the rainy season, when the natural pools are full. During the dry season (December to March), many of them dry up, although some remain with water.

What is the ecological importance of Barros Lagoons?

Barros Lagoons form a unique ecosystem where marine and continental species coexist. The region shelters about 70 fish species, as well as crustaceans, birds, and other animals adapted to this transition between the sea and the continent.