TheRamlat al-Sab'atayn (Arabic:رملة السبعتين,lit. 'Sand of the Two Sevens') is adesert region that corresponds with the northern deserts of modernYemen (Al-Jawf,Marib,Shabwah governorates) and southwesternSaudi Arabia (Najran province).[1]
It comprises mainly transverse and seifdunes and covers an area of about 100 by 240 kilometres (60 by 150 mi), roughly 26,000 square kilometres (10,000 sq mi).[2]
The Ramlat as Sab'atayn includes part of what was known tomedievalArabgeographers as theSayhad (Arabic:صيهد,romanized: Ṣayhad). It extends from al-Khawr to the edge of theRub' al-Khālī or Empty Quarter. It includes the Yemenimuhafazahs ofal-Jawf,Ma'rib andShabwa.
15°42′00″N46°20′00″E / 15.7000°N 46.3333°E /15.7000; 46.3333
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