The Mesquite Flat Sand Dunes are located in Death Valley National Park, California. These dunes are the largest in the park, covering an area of about 14 square miles. They are primarily composed of fine, golden sand and are shaped by the wind, creating stunning patterns and ripples. Visitors can explore the dunes by walking or hiking, with the highest dune reaching approximately 100 feet. The area is known for its unique desert landscape, which includes various plant species like mesquite trees and creosote bushes. The dunes are also a popular spot for photography, especially during sunrise and sunset.