Try the Antarctic.
A desert is a landscape or region that receives very little precipitation – less than 250 mm per year (about ten inches). Approximately 1/3 of Earth’s land surface is a desert.
The largest areas on Earth that fit this definition are the polar regions. Antarctica has a surface area of about 14 million square kilometers (5.5 million square miles), making it the largest desert in the world.
The largest non-polar desert is the Sahara Desert of northern Africa. The Sahara has a surface area of 9 million square kilometers (3.5 million square miles), and it stands as the largest non-polar desert in the world.