Please log in if you don't want to post anonymously (anonymous users cannot post links).
Note: VirtualGlobetrotting is an entertainment website is and is not associated with this post, location or person.
Some further info about Tibesti:
http://en.wikipedia.org/wiki/Tibesti_Mountains
http://volcano.und.nodak.edu/vwdocs/volc_images/img_Tibesti.html
I think the area is called "Al Uwaynat desert". This map has a spot labelled "Al Uwaynat" that corresponds to the location of the rock formation:
http://www.lib.utexas.edu/maps/africa/libya_pol93.jpg
There's a photo file with the same name here:
http://www.archipress.org/images/strategie/uwaynat.jpg
More info:
http://gisaf.sil.at/uwaynat.html
Fascinating expedition accounts (they spell it "Uweinat"):
http://www.fjexpeditions.com/frameset/nov04.htm
And, finally, I found the names of the rock formations. Map id 3477 is centered on "Jebel Arkenu":
http://www.fjexpeditions.com/frameset/g_arkenu.htm
Immediately to the southeast is "Jebel Uweinat":
http://www.fjexpeditions.com/frameset/uweinat.htm