What and where are the biggest sand dunes in world?

The biggest sand dunes in the world are located in the Arabian Peninsula, specifically in the Empty Quarter (Rub' al Khali) desert of Saudi Arabia. These dunes are known as the "Nefud" dunes and cover an area of approximately 65,000 square kilometers (25,000 square miles). The individual sand dunes within the Nefud can reach heights of up to 300 meters (984 feet).

Where are the biggest sand dunes in the world?

The Empty Quarter (Rub' al Khali) desert of Saudi Arabia is located in the southern part of the Arabian Peninsula. It is the largest sand desert in the world, covering an area of approximately 650,000 square kilometers (250,000 square miles). The desert is characterized by its vast, shifting sand dunes, which are some of the largest and tallest in the world.