Unconsolidated Kalahari sand covers 2.5 million km? of central southern Africa, the 'Mega Kalahari', extended far beyond the Kalahari Desert of today. Relic aeolian, lacustrine and fluvial landforms indicate that in the Quaternary the Kalahari sand has been deposited and reworked by a variety of processes. Large areas of sand have no identifiable landform associations, and because of this, sedimentological studies are necessary for a better interpretation of the palaeoenvironmental history of the Mega Kalahari. Geomorphology; Landscape evolution.