© Ralf Kaiser
Location: White Sands National Monument, NM, USA
The White Sands National Monument is a U.S. National Monument located about 16 miles (26 km) southwest of Alamogordo in western Otero County and northeastern Doña Ana County in the state of New Mexico, at an elevation of 4,235 feet (1,291 m). The area is in the mountain-ringed Tularosa Basin and comprises the southern part of a 275 square miles (710 km2) field of white sand dunes composed of gypsum crystals. It is the largest gypsum dune field in the world.