Q: How many countries make up the Rub' al Khali desert?

<p style=";text-align:left;direction:ltr">Arab Weather - The Rub&#39; al Khali desert extends across four countries in the Arabian Peninsula, which are:</p><ol style=";text-align:left;direction:ltr"><li style=";text-align:left;direction:ltr"> Saudi Arabia, where the largest part of the desert area is located.</li><li style=";text-align:left;direction:ltr"> United Arab Emirates, specifically in the southeastern regions of the country.</li><li style=";text-align:left;direction:ltr"> Oman is located in the southwestern part of the Sultanate.</li><li style=";text-align:left;direction:ltr"> Yemen in the northeastern regions of the country.</li></ol><p style=";text-align:left;direction:ltr"> This desert is considered one of the largest and harshest sand deserts in the world.</p>