Smoke, soot, explosion, oil ? I suppose that the shape is due to the wind direction and the dunes.
Strange trace in the desert
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By dda @ 2005-11-06 09:42:02
Analogman
@ 2005-11-06 10:16:36
Soot from an oil well fire.
cthippo
@ 2010-09-20 18:18:39
Maybe. Could also be an area of exposed black soil that is being blown in the wind. I don't see any roads or infrastructure that would suggest a well site.