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Racetrack Playa

The Racetrack Playa, or The Racetrack, is a scenic dry lake feature with "sailing stones" that leave linear "racetrack" imprints. The stones are said to move from place to place and leave an imprint of their track.

Racetrack Playa  is considered among the top 10 mysterious places of the world.

Location:

Racetrack Playa is located above the northwestern side of Death Valley, in Death Valley National Park, Inyo County, California, U.S..

Geography:

The Racetrack playa is 3608 feet (1130 m) above sea level, and 2.8 miles (4.5 km) long (North-South) by 1.3 miles (2 km) wide (East-West). It is also exceptionally flat and level with the northern end being only 1.5 inches (4 cm) higher than the southern. The highest point surrounding it is 5,678 feet (1731 m) high Ubehebe Peak, rising 1970 feet (571 m) above the lakebed 0.85 mile (1.37 km) to the west.The playa is in the small Racetrack Valley endorheic basin between the Cottonwood Mountains on the east and Nelson Range to the west. 

                  

During periods of heavy rain, water washes down from the mountains onto the playa, forming a shallow, short-lived endorheic lake. Under the hot desert sun the thin veneer of water quickly evaporates leaving behind a surface layer of soft slick mud. As the mud dries it shrinks and cracks into a mosaic pattern of interlocking polygons. 

Mystery of Sailing Stones:

The sailing stones are a geological phenomenon found in the Racetrack. The stones slowly move across the surface of the playa, leaving a track as they go, without human or animal intervention. They have never been seen or filmed in motion. Racetrack stones only move once every two or three years and most tracks last for three or four years. Stones with rough bottoms leave straight striated tracks while those with smooth bottoms wander. Stones sometimes turn over, exposing another edge to the ground and leaving a different-sized track in the stone's wake.

The sailing stones are most likely moved by strong winter winds, reaching 90 mph, once it has rained enough to fill the playa with just enough water to make the clay slippery. The prevailing southwest winds across Racetrack playa blow to northeast. Most of the rock trails are parallel to this direction, lending support to this hypothesis.

An alternate hypothesis builds upon the first. As rain water accumulates, strong winds blow thin sheets of water quickly over the relatively flat surface of the playa. A layer of ice forms on the surface as night temperatures fall below freezing. Wind then drives these floating ice sheets, their aggregate inertia and large area providing the necessary force required to move the larger stones. Rock trails would again remain parallel to the southwest winds.A more recent theory is that ice collars form around rocks and when the local water level rises, the rocks are boyantly floated off the soft bed. The minimal friction allows the rocks to be moved by arbitrarily light winds.

Still the Racetrack Playa remains as a mystery.

Visiting:

Access is via Racetrack Road, reached at the Grapevine Junction near Scotty's Castle. The gravel road rounds the western side of the playa to the parking area with descriptive signs by the National Park Service. A bench here, placed by the Mano Seca Group, has scenic views of The Racetrack, The Grandstand, and mountain scenery.

Camping, while not allowed on the playa, is available in "primitive campsite" areas to the north and south.

Racetrack Road passes by Ubehebe Crater, another unique feature, on the drive in. To the northwest are the Eureka Valley Sand Dunes and the Saline Valley, in a remote section of the park.