UZA/NM: White Sands National Monument
White Sands National Monument is a massive field of snow-white sand – 710-km² (275-mi²) – in the south of New Mexico. It has high dunes of several types, moving sands, and all the dune and desert flora and fauna. What makes it interesting thought is the fact that the sand is composed of gypsum crystals. Gypsum is very rarely found in the form of sand since its water-soluble, and is normally dissolved by rain and carried out to sea. The dunes are trapped between two mountain ranges.