The largest desert in the world is the Antarctic Desert. It covers the continent of Antarctica, which has an area of about 14 million square kilometers (5.4 million square miles). While we typically associate deserts with dry, hot conditions, the Antarctic Desert is actually a cold desert, with very little precipitation and temperatures that can drop to as low as -90 degrees Celsius (-130 degrees Fahrenheit). The next largest desert is the Arctic Desert, which covers much of the Arctic region and has similar characteristics to the Antarctic Desert.
However, if we’re talking about hot deserts, the largest one in the world is the Sahara Desert, which covers most of North Africa and has an area of about 9.2 million square kilometers (3.6 million square miles).