1. Sahara Desert. The Sahara Desert is the world's largest hot desert; it stretches over 3,500,000 square miles in Northern Africa.The Great Victoria Desert stretches across 163,900 square miles in both South Australia and Western Australia.Summers in the Arabian desert are quite intense; temperatures can reach as high as 129 °F.alahari Desert. 1. Sahara Desert. The Sahara Desert is the world's largest hot desert; it stretches over 3,500,000 square miles in Northern Africa. The Great Victoria Desert stretches across 163,900 square miles in both South Australia and Western Australia.