NAMIBIAN FAIRY RINGS

Yep, that's a vehicle.

 

One theory for the formation of these circles is that when a rare amount of rain falls, plants send their roots to the moisture. Over time, this concentration of roots deplete that area so that nothing grows except in the ring around it. This forms a kind of catch basin when rain does occur. Curiously, researchers found that these rings are regularly spaced between one another as a way to reduce competition.