A hamada (Arabic, حمادة ḥammāda) is a type of desert landscape consisting of largely barren, hard, rocky plateaus, with very little sand. A hamada may sometimes also be called a reg, though this more properly refers to a stony plain rather than a highland.Hamada's exist in contrast to ergs, which are large areas of shifting sand dunes.The world's largest hamada is the Hamada du Draa, in the north-west Sahara desert, between Morocco, Algeria and Western Sahara. Hamada areas forms 70% of the Sahara desert.
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