The Sahara Desert is chiefly known for its vast **sand dunes** and **extreme aridity**. This desert spans several North African countries and is characterized by its dry conditions and high temperatures. The notable features include shifting sand dunes, rocky plateaus, and occasional oases. The Sahara is not only the largest hot desert in the world but also serves as a unique ecosystem that hosts various **flora** and **fauna** adapted to harsh conditions. Its vastness and specific climatic conditions make it a significant natural feature of the planet.