Located in the State of Maranhão, on the north shore of Brazil, the Lençóis Maranhenses National Park is an area of about 300 square kilometers (155,000 ha) of blinding white dunes and deep blue lagoons, forming one of the most beautiful and unique places in the world.
The dunes invade the continent over 50km (31 miles) from the coast, creating a landscape that can reminds one of a white bed sheet, when seen from above.
What distinguishes this region from a desert is the amount of rain the drops over the dunes, creating ponds of crystal clear water on the depression between dunes. Despite its desert-like appearance, Lençóis Maranhenses records an annual rainfall of 1,600mm (i.e. 62.9 inches), 300 times more than in the Sahara.
During the period of drought, the lagoons evaporates and become completely dried. After the rainy season, the lagoons are home of many species of fishes, turtles and clams. The mystery in this story lies in the fact that when the lagoons fill up, life comes back, as if they had never left the place. One of the hypotheses to explain the phenomenon is that the eggs of the fish and crabs are maintained alive in the sand, exploding when rain come back.
The strong heat in the region (over 30ºC) is rewarded by a cooling
bath in the crystalline lagoons and the untouched beaches. The most
famous lagoon, due to its beauty, is the Blue Lagoon.
PS: We have just trailer of this documentary for now and still searching for new source full length.