Lençóis Maranhenses seems like an archetypal desert, but in fact, it is not an actual one. Lying just outside the Amazon Basin, the place is subject to a regular rain season during the beginning of the year. The rains cause a peculiar phenomenon: fresh water collects in the valleys between sand dunes and is prevented from percolating down by a layer of impermeable rock which lies underneath the sand. The resulting blue, green and black "lagoons" are surrounded by the desert-like sand.
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