The largest desert in the world by size is the Sahara Desert, which spans approximately 9.2 million square kilometers (3.6 million square miles). Located in North Africa, it is characterized by vast stretches of sand dunes, rocky plateaus, and sparse vegetation. The Sahara plays a crucial role in the climate and ecology of the surrounding regions, influencing weather patterns and local economies. Despite its harsh environment, the Sahara is home to various nomadic tribes and adapted wildlife, showcasing a unique ecosystem that thrives in extreme conditions.