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Lençóis Maranhenses

A coastal field of white dunes in Maranhão, Brazil, whose hollows fill with freshwater lagoons every rainy season. Dated dune sands go back some 130,000 years. A national park since 1981 and a World Heritage Site since 2024.

Dated events and their evidence

• about 130,250 years ago mainstream
  the oldest sand in a 13.8 m dune succession is laid down; luminescence dating gives 132,200 ± 7,000 years source
• 1981 CE mainstream
  on 2 June the area is protected as a national park of 155,000 ha source
• 2024 CE mainstream
  in July it is inscribed as a UNESCO World Heritage Site source

Where

2.5330° S, 43.1170° W

Sources

• https://en.wikipedia.org/wiki/Len%C3%A7%C3%B3is_Maranhenses_National_Park
• https://doi.org/10.1016/j.quaint.2019.12.012
• https://doi.org/10.1038/s41598-019-43735-0
• https://ozgeology.com/blogs/news/why-this-desert-fills-with-thousands-of-lakes-each-year-lencois-maranhenses

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