Astonishingly shaped and immaculately white limestone concretions emerge from the "Great Sand Sea" discovered by the German Gerhard Rohlfs in 1873. Most impressive are the formations of Sahara el-Beida , where the rocks have been eroded in..

The desert 20km south of Bawati is covered with the dark conical masses of former volcanic hills that used to be buried and have since been eroded by time. The visual effect is of solitary mountains seemingly piercing the sand. Erosion has left bits ..