Lençóis Maranhenses National Park
Lençóis Maranhenses looks like a mistake in the laws of nature: thousands of stark white sand dunes rolling to the horizon, each hollow filled with crystal-clear rainwater lagoons of impossible turquoise and blue. It is not a desert — the annual rainfall is too high — which is exactly why the lagoons exist, and why the landscape feels utterly surreal.
The Lagoons and When to Go
The lagoons fill between January and June as seasonal rains collect in the valleys between dunes. By July the water is at its deepest and clearest — warm enough to swim in, calm enough to reflect the sky like a mirror. The most famous lagoon, Lagoa Azul, sits about 8 km from the town of Barreirinhas and is the standard first stop on any guided walk.
For a more remote experience, the village of Atins on the eastern edge of the park offers access to lagoons that see a fraction of the visitors. The walk from Atins to Lagoa da Gaivota takes roughly two hours across the dunes and rewards you with almost total solitude.
Getting There and Getting Around
The gateway town is Barreirinhas, reached by a 4-hour bus from São Luís or a short charter flight. From Barreirinhas, all park access is by 4WD truck or boat along the Preguiças River — no private vehicles are permitted inside the park boundaries.
Guided tours are mandatory and range from half-day lagoon walks to multi-day trekking expeditions that cross the entire park. The most spectacular experience is a sunset walk to a high dune crest, where the low light turns the white sand deep orange and every lagoon below glows.
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