Sayhad
Sayhad or Ramlat as Sab'atayn is a desert region that corresponds with the northern deserts of modern Yemen and Southwestern Saudi Arabia. Located at 15°42′N 46°20′E.
Ramlat as Sab'atayn occupies an area of about 26,000 square kilometers being roughly 100 × 240 km occupying relatively flat alternating dunes. The Ramlat as Sab'atayn includes part of what was known to medieval Arab geographers as Ṣayhad and it extends from al-Khawr to the edge of the Rub al-Khali desert.
The desert is located in the governorates of Al-Jawf, Marib and Shabwa of Yemen.
