Mesquite Dunes, Death Valley CA

The Mesquite Sand Dunes are at the northern end of the valley floor and are nearly surrounded by mountains on all sides. Due to their easy access from the road and the overall proximity of Death Valley to Hollywood, these dunes have been used to film sand dune scenes for several movies including films in the Star Wars series. The largest dune is called Star Dune and is relatively stable and stationary because it is at a point where the various winds that shape the dunes converge. The depth of the sand at its crest is 130-140 feet (40-43 m) but this is small compared to other dunes in the area that have sand depths of up to 600-700 feet (180-210 m) deep. Star Dune is shaped like a starfish.
The primary source of the dune sands is probably the Cottonwood Mountains which lie to the north and northwest. The tiny grains of quartz and feldspar that form the sinuous sculptures that make up this dune field began as much larger pieces of solid rock.
In between many of the dunes are stands of creosote bush and some mesquite on the sand and on dried mud, which used to cover this part of the valley before the dunes intruded (mesquite was the dominant plant here before the sand dunes but creosote does much better in the sand dune conditions).Death Valley is a valley in the U.S. states of California and Nevada, and is the location of the lowest elevation in North America at 282 ft (86 m) below sea level. It is one of many places on land which fall below mean sea level. Located southeast of the Sierra Nevada range in the Great Basin and the Mojave Desert, it constitutes much of Death Valley National Park. It runs north-south between the Amargosa Range to the east and the Panamint Range to the west; the Sylvania Mountains and the Owlshead Mountains form its northern and southern boundaries, respectively. It has an area of about 3,000 square miles (~7,800 km²).
Geologically, Death Valley is considered one of the best examples of the Basin and Range configuration. It lies at the southern end of a geological trough known as the Walker Lane which runs north into Oregon. The valley is bisected by a right lateral strike slip fault, the Death Valley Fault. The eastern end of the left lateral Garlock Fault intersects the Death Valley Fault. Located on the border of California and Nevada, Death Valley is the principal feature of the Mojave and Colorado Deserts Biosphere Reserve.
Temperatures in the Valley can range from up to 130°F (54 °C) in the day in the summer, to below freezing at night in the winter. The lowest temperature on record at Furnace Creek Inn is 15 °F (-9 °C). The National Climatic Center reports that temperatures at Furnace Creek reach 90 °F (32 °C) on an average of 189.3 days annually and 100 °F (38 °C) on an average of 138.0 days annually. Freezing temperatures occur on an average of 11.7 days each year.
Many of Death Valley's narrow, serpentine roads were built in the 1930s and cannot be driven at high speed. Badwater, located within Death Valley, is the specific location of the lowest point in North America. (Surprisingly, the highest point in the contiguous United States, Mount Whitney, is just 76 miles (123 km) west of Death Valley). At 282 feet (86 m) below sea level, Death Valley shares most of the characteristics found in other places around the world that lie below sea level.