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

Arab Weather - The Rub' al Khali desert extends across four countries in the Arabian Peninsula, which are:

1. Saudi Arabia, where the largest part of the desert area is located.
2. United Arab Emirates, specifically in the southeastern regions of the country.
3. Oman is located in the southwestern part of the Sultanate.
4. Yemen in the northeastern regions of the country.

This desert is considered one of the largest and harshest sand deserts in the world.