The Ramlat al-Sab`atayn (Arabic رملة السبعتين) is a region of desert in north-central Yemen. It comprises mainly transverse and seif dunes and covers an area of about 60 by 150 miles (240 km), roughly 10,000 square miles. The area includes part of what was known to medieval Arab geographers as the Ṣayhad. It extends from al-Khawr to the edge of the Rub' al-Khālī or Empty Quarter. It includes the Yemeni muhafazahs of al-Jawf, Ma'rib and Shabwa.
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