Lençóis Maranhenses National Park, Maranhão, Brazil. A vast area of undulating, swept sand dunes between which rainwater lakes form at certain times of the year. The result is midnight blue lakes offset by brilliant white dunes

Stock photo: Lençóis Maranhenses National Park, Maranhão, Brazil. A vast area of undulating, swept sand dunes between which rainwater lakes form at certain times of the year. The result is midnight blue lakes offset by brilliant white dunes was taken by camilamm .