Ubari Sand Sea, Libya. Longitudinal dunes in the Ubari Sand Sea about 30 kilometers southwest of Brach, looking northeast. The dunes are several kilometers long, and some are more than 100 meters high. Parallel longitudinal dunes can be seen in the foreground. Dune trends are N. 40 degrees to 45 degrees east. The slightly shadowed areas between the dunes are thought to be blowouts; the dark spots are vegetation. Circa 1958. Figure 12, U.S. Geological Survey Professional Paper 660.
Digital File:ggh00013

ID. Goudarzi, G.H. 13