Where is the world's largest desert?Thr world's largest desert is actually the continent of Antarctica; it is the world's driest place. It receives less than two inches of precipitation annually. Antarctica is 5.5 million square miles (14,245,000 square kilometers) in area.
Outside of polar regions, Northern Africa's Sahara Desert is the world's largest desert at more than 3.5 million square miles (9 million square kilometers), which is slightly smaller that the size of the United States, the world's fourth largest country. The Sahara strectches from Mauritania to Egypt and Sudan.