Lencois maranhenses dunes pools

Lençóis Maranhenses, in Maranhão, Brazil, features one of the world's most unique landscapes: white sand dunes dotted with crystal-clear lagoons that appear during the rainy season.

About this subject

Lençóis Maranhenses is a national park located in the state of Maranhão, northeastern Brazil. Its landscape is composed of white sand dunes up to 40 meters high, stretching across about 155,000 hectares. Between May and September, heavy rains fill the depressions between the dunes, creating thousands of crystal-clear freshwater lagoons. The most famous are Lagoa Azul, Lagoa da Esperança, and Lagoa da Gaivota, with colors ranging from emerald green to turquoise blue.

The phenomenon occurs because the water table rises during the rainy season, surfacing in the interdunal basins. The sand, mostly quartz, acts as a natural filter, keeping the water pristine. The water temperature is mild, and since there are no significant aquatic animals, it is safe to swim. The area also includes restinga and mangrove ecosystems, providing habitat for migratory birds and endangered species like the crab-eating raccoon.

Visitors are advised to hire local guides or tour agencies from Barreirinhas, the main gateway town. The park can be explored on foot, by jeep, or by helicopter for spectacular aerial views. Due to the fragile environment, camping is prohibited and regular sunscreen may contaminate the lagoons; biodegradable alternatives are recommended. The best time to see the lagoons full is right after the rainy season peak, from June to August. By September, many lagoons begin to evaporate.

Frequently Asked Questions

What is the best time to visit Lençóis Maranhenses?

The best time is from May to September, when rains fill the lagoons. The peak beauty occurs from June to August, with full lagoons and vibrant colors.

How do I get to Lençóis Maranhenses?

The main gateway is Barreirinhas, which has regular flights from São Luís (1 hour) and bus services from various northeastern capitals. From there, local guides take you to the park via sandy roads.

Can I swim in the lagoons?

Yes, swimming is allowed and safe. The water is fresh and clear, with no dangerous animals. It is recommended to use biodegradable sunscreen to avoid polluting the lagoons.