The correct answer is Sahara. The Sahara desert is the largest desert in the world, covering an area of about 9.2 million square kilometers. It is located in northern Africa and spans across several countries including Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Sudan, and Tunisia. The Sahara is known for its vast stretches of sand dunes, extreme temperatures, and arid conditions, making it one of the most inhospitable places on Earth.