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Lençóis Maranhenses National Park is a Park  in north east  Brazil, Lençóis Park is known for it’s bizarre phenomena: Blue lagoons which appear to sprite out of the desert’s sand dunes 

The lagoons get filled with fresh water via heavy rains which fill the lagoons – they are fullest around August each year.

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The Lençóis Maranhenses National Park. It is an area of low, flat, occasionally flooded land, overlaid with large, discrete sand dunes. It encompasses roughly 1,500 km2 (580 sq mi), and despite abundant rain, supports almost no vegetation. The area became a National Park on June 2, 1981.

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Mount Roraima (Spanish: Monte Roraima [ˈmonte roˈɾaima], also known as Tepuy Roraima and Cerro Roraima; Portuguese: Monte Roraima [ˈmõtʃi ʁoˈɾɐ̃jmɐ]) is the highest of the Pakaraima chain of tepui plateau in South America.[4]:156 First described by the English explorer Sir Walter Raleigh in 1596, its 31 km2 summit area[4]:156 consists on all sides of cliffs rising 400 metres (1,300 ft). The mountain also serves as the triple border point of Venezuela (85%), Brazil (5%) and Guyana (10% of the territory claimed by Venezuela).[4]:156

Mount Roraima lies on the Guiana Shield in the southeastern corner of Venezuela's 30,000-square-kilometre (12,000 sq mi) Canaima National Park forming the highest peak of Guyana's Highland Range. The tabletop mountains of the park are considered some of the oldest geological formations on Earth, dating back to some two billion years ago in the Precambrian.

The highest point in Guyana and the highest point of the Brazilian state of Roraima lie on the plateau, but Venezuela and Brazil have higher mountains elsewhere. The triple border point is at 5°12′08″N 60°44′07″W, but the mountain's highest point is Maverick Rock, 2,810 metres (9,219 ft), at the south end of the plateau and wholly within Venezuela.

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