Plateau du Tademaït and Dunes of the Grand Erg Oriental, Algeria – June 26th, 200928.8N 4.4E
The sand dunes of the Grand Erg Oriental, in the Sahara Desert in Algeria, stop abruptly along the edge of the Plateau du Tademaït. The plateau stretches North-South from El Goléa to In-Salah.
It is almost completely flat, in contrast to the dunes of the Grand Erg. The dunes here appear to be seif dunes: dunes formed in long rows by air currents.
Seif dunes have long, sharp ridge lines parallel to the prevailing direction of the wind. Cross-winds may alter the height or width of such lengthy dunes, with the slope being steep on both sides.