Dasht-e Kavir or Great Salt Desert is a large desert lying in the middle of the Iranian plateau. The area of this desert stretches from the Alborz mountain range in the north-west to the Dasht-e Lut in the south-east and is partitioned between the Iranian provinces of Khorasan, Semnan, Tehran, Isfahan and Yazd. Dasht-e Lut is the world’s 25th largest desert. Iran’s geography consists of a plateau surrounded by mountains and divided into drainage basin. Dasht-e Lut is one of the largest of these desert basins.