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AlbinoFlea picture
@ 2005-06-24 12:03:30
That's the Aorounga impact crater. From NASA:

...the Aorounga impact crater, with a diameter of about 17 kilometers (10.5 miles). The original crater was buried by sediments, which were then partially eroded to reveal the current ring-like appearance. The dark streaks are deposits of windblown sand that migrate along valleys cut by thousands of years of wind erosion.

See http://visibleearth.nasa.gov/view_rec.php?id=493
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