Parque Nacional dos Lençóis Maranhenses, Estado do Maranhão, Brasil

The Lençóis Maranhenses National Park is located in Maranhão state, in northeastern Brazil.  Lençóis means the sheets in Portuguese, 155,000ha area composed of large white dunes seems like white sheets.  This medium-sized sand consists of almost 100% quartz.  The grains are 0.15-0.7mm in diameter, well-rounded.