What on Google Earth?*

Jani has been exploring the Sahara Desert using Google Earth, and would like to know if this structure in southeast Algeria is a crater or not (it can be found at 22 48′ N 9 29′ E):

poss_crater.jpg

Before I give my thoughts, I’d be interested to hear what you good people think. Is it a crater? What evidence are you using to make your judgement?
*with apologies to Brian.

Categories: geohazards, geology, planets