What is the largest desert in the world?

When considering the world's largest deserts, a common misconception arises from the popular image of vast, scorching sand dunes. While areas like the Antarctic and Arctic are technically the largest deserts on Earth due to their extremely low precipitation, the Sahara stands as the undisputed champion of hot deserts. Covering an immense area of approximately 3.6 million square miles (9.2 million square kilometers), it blankets a significant portion of North Africa, making it comparable in size to the entire United States or China.

This colossal desert stretches across eleven countries, from the Atlantic Ocean in the west to the Red Sea in the east. Its landscape is far more diverse than just endless sand; in fact, sand dunes, known as ergs, make up only about 25 to 30 percent of its surface. The majority of the Sahara consists of rocky plateaus, gravel plains, salt flats, and even mountains, such as the Tibesti Mountains, where the highest peak, Emi Koussi, is an extinct volcano.

The Sahara is renowned for its harsh and extreme climate. Daytime temperatures can soar above 122°F (50°C), with a record high of 136°F (58°C) once recorded in Libya. However, the nights can be surprisingly cold, with temperatures plummeting to near freezing due to the lack of humidity. Rainfall is exceptionally rare, with many regions receiving less than an inch (2.5 cm) annually, and some areas experiencing decades without significant precipitation. Despite these challenging conditions, various resilient species, including camels, fennec foxes, gazelles, and scorpions, have adapted to thrive in this formidable environment. The name "Sahara" itself is derived from the Arabic word "ṣaḥrāʾ," simply meaning "desert."