The park covers 589.9 km2 in the Tularosa Basin, including the southern 41% of a 710 km2 field of white sand dunes composed of gypsum crystals. This gypsum dunefield is the largest of its kind on Earth, with a depth of about 9.1 m, dunes as tall as 18 m, and about 4.1 billion metric tons of gypsum sand.
Approximately 12,000 years ago, the land within the Tularosa Basin featured large lakes, streams, grasslands, and Ice Age mammals. As the climate warmed, rain and snowmelt dissolved gypsum from the surrounding mountains and carried it into the basin. Further warming and drying caused the lakes to evaporate and form selenite crystals. Strong winds then broke up crystals and transported them eastward. A similar process continues to produce gypsum sand today.
Thousands of species of animal inhabit the park, a large portion of which are invertebrates. Several animal species feature a white or off-white coloration. At least 45 species are endemic, living only in this park, with 40 of them being moth species. The Tularosa Basin has also seen a number of human inhabitants, from Paleo-Indians 12,000 years ago to modern farmers, ranchers, and miners.
White Sands National Park was originally designated White Sands National Monument on January 18, 1933 by President Herbert Hoover; it was redesignated as a national park by Congress and signed into law by President Donald Trump on December 20, 2019. It is the most visited NPS site in New Mexico, with about 600,000 visitors each year. The park features a drive from the visitor center to the heart of the dunes, picnic areas, backcountry campground in the dunefield, marked hiking trails, and sledding on the dunes. Ranger-guided orientation and nature walks occur at various times and months throughout the year.
White Sands National Park is the most visited NPS site in New Mexico, with about 600,000 visitors each year. In year two of the pandemic, White Sands National Park saw more than 780,000 visitors from both locals and visitors. Many visitors arrive during the warmer months from March through August, but sledders and photographers can be seen throughout the dunes year-round. March and July are the two busiest months with more than 60,000 visitors each, or about 2,000 per day, while November through February have the fewest visitors with less than 30,000 each month, or fewer than 1,000 per day.
According to Wikipedia