Desert in central Iran
Dasht-e Kavir ( in classical Persian, from "khwar" (low), and "dasht" (plain, flatland)) or the Kavir Desert, also known as Kavir-e Namak or the Great Salt Desert, is a large desert lying in the middle of the Iranian Plateau. It is about long by wide with a total surface area of about , making it the world's 24th largest desert. The desert stretches from the Alborz mountain range in the north-west to the Dasht-e Lut in the south-east. It is spread across the Iranian provinces of Khorasan, Semnan, Tehran, Isfahan and Yazd.
Features.
In the center of the desert lies the salt marshes of Kavir Buzurg (Great Kavir), which is about long and wide. In the western part of the desert lies the Daryahcheh-e Namak ("salt lake"), . It contains some large salt plates in a mosaic-like shape. It is part of a protected ecological zone, the Kavir National Park.
Climate and structure.
Dasht-e Kavir has an arid climate with little precipitation. However, there is usually some rainfall in winter, as well as the mountains that surround it, provide plenty of runoff—enough to create vast seasonal lakes, marshlands and playas. Daytime and nighttime temperatures can vary by as much as over the course of a year. The weather can get quite cold during the nighttime in winter, routinely dropping to below in some areas.
The desert soil is covered with sand and pebbles; there are marshes, seasonal lakes and seasonal river beds. The high temperatures and low humidity cause extreme vaporization, which leaves the marshes and mud grounds with large crusts of salt. 
Post-glacial lake system.
Almost 3,000 years ago, at the start of the post-glacial era, the Kavir was a series of vast lakes. 
Wildlife.
Vegetation in the Dasht-e Kavir is adapted to the hot and arid climate as well as to the saline soil in which it is rooted.
Persian gazelles live in parts of steppe and desert areas of the central plateau. Wild sheep ("Ovis orientalis"), camels, wild goats ("Capra aegagrus") and Persian leopards are common in mountainous areas. Night life brings on wild cats, wolves, foxes, and other carnivores.
Cultivation.
The extreme heat and many storms in Dasht-e Kavir cause extensive erosion, which makes it almost impossible to cultivate the lands. The desert is almost uninhabited and knows little exploitation.
References.
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