The Sailing/Moving Stones of Racetrack Playa:
The sailing stones are a natural phenomenon found in the Racetrack Playa (a seasonally dry lake located in the northern part of the Panamint Mountains in Death Valley National Park, California, U.S.A.). The big stones slowly move across the surface of the playa, going away a track as they're going, while not human or animal intervention. They have never been seen or recorded in motion and don't seem to be distinctive to The racecourse. Similar rock travel patterns are recorded in many different playas within the region however the amount and length of travel grooves on the race course are notable. Racecourse stones solely move once each 2 or 3 years and most tracks last for simply 3 or four years. Stones with rough bottoms leave straight striated tracks whereas those with sleek bottoms wander. Stones typically flip over, exposing another edge to the bottom and going away a different-sized track within the stone’s wake.