The Playa
The Playa refers to the Black Rock Desert
, a dry lake bed in northwest Nevada where Burning Man has been held since 1990.
In the summer, the surface is cracked dry alkaline mud (not sand).
When crushed, this mud turns into a fine sticky white powder — which gets everywhere. Vehicle and foot traffic break up the surface. Add strong winds and you get dust storms. Playa dust's corrosive alkalinity quickly rusts metal objects. Cleaning playa dust is made easier by using a mildly acidic solution like vinegar or carbonated water.
Each winter, the Playa mud becomes again wet, and passage over the lake bed surface is impossible.
Here are some links to explorations around the Playa in the Black Rock Desert :