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Dasht-e Kavir
Sand dunes in the Rig-e Jenn in the Dasht-e Kavir
Dasht-e Kavir
Length	800 km (500 mi)
Width	500 km (310 mi)
Area	77,600 km2 (30,000 sq mi)
Naming
Native name	دشت كوير (Persian)
Geography
Country	Iran
Province	Khorasan, Semnan, Tehran, Isfahan, Yazd
Coordinates	34°44′15.2″N 54°49′37.56″E / 34.737556°N 54.8271000°E / 34.737556; 54.8271000

Dasht-e Kavir (Persian: دشت كوير, lit. 'Low Plains' 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 800 kilometres (500 mi) long by 320 kilometres (200 mi) wide with a total surface area of about 77,600 km² (30,000 sq mi), making it the world's 24th largest desert.^[1] 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.

In the center of the desert lies the salt marshes of Kavir Buzurg (Great Kavir), which is about 320 km (200 mi) long and 160 km (99 mi) wide. In the western part of the desert lies the Daryahcheh-e Namak ("salt lake"), 1,800 km² (690 sq mi). It contains some large salt plates in a mosaic-like shape. It is part of a 4,000 km² (1,500 sq mi) protected ecological zone, the Kavir National Park.

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 70 °C (130 °F) over the course of a year. The weather can get quite cold during the nighttime in winter, routinely dropping to below 0 °C (32 °F) 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.

Almost 3,000 years ago, at the start of the post-glacial era, the Kavir was a series of vast lakes.^{[citation needed]}

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)^[5] and Persian leopards are common in mountainous areas. Night life brings on wild cats, wolves, foxes, and other carnivores.

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.

• Dasht-e Lut – Desert in Iran ('Desert of Emptiness')
• Geography of Iran
• International rankings of Iran
• List of deserts by area – List of the largest deserts in the world by area