The desert that occupies parts of Tunisia and Algeria is the Sahara Desert. This expansive desert is the largest hot desert in the world, covering over 9 million square kilometers across several North African countries. The Sahara is characterized by its vast sand dunes, rocky plateaus, and sparse vegetation. It has a significant impact on the climate of the region and is home to various nomadic cultures adapted to its harsh conditions. The desert is also rich in natural resources, including oil and mineral deposits.