Ramlat al-Sab'atayn

{{Short description|Region of desert in north-central Yemen}}

file:Yemeni Desert.jpg

The Ramlat al-Sab'atayn ({{langx|ar|رملة السبعتين}}) is a desert region that corresponds with the northern deserts of modern Yemen (Al-Jawf, Marib, Shabwah governorates) and southwestern Saudi Arabia (Najran province).[https://books.google.com/books?id=6DYVAAAAIAAJ&dq=sayhad+yemen&pg=PA337] Sayhad Desert

It comprises mainly transverse and seif dunes and covers an area of about {{convert|60|by|150|mi|km|order=flip|-1}}, roughly {{convert|10,000|sqmi|km2|order=flip}}.[http://www.britannica.com/EBchecked/topic/514944/Ramlat-al-Sabatayn Ramlat al-Sabʿatayn]

The Ramlat as Sab'atayn includes part of what was known to medieval Arab geographers as the Sayhad ({{langx|ar|صيهد|translit=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.