DAHNA', AD-

(Arabic: desert), great arc of reddish sandy desert, central Saudi Arabia, extending about 800 miles (1,300 km) southward from the northeastern edge of an-Nafud (desert) to the northwestern borders of the desert Rub' al-Khali (the Empty Quarter). Thus, ad-Dahna' links the great deserts of Saudi Arabia. It consists of seven major sand ridges, which are separated from one another by plains. It measures about 30 miles (48 km) in width and provides spring and winter pastures. Ad-Dahna' is crossed by roads connecting Kuwait with az-Zilfi and Riyadh, and Riyadh with Hasa.