<Tr> <Th> Width </Th> <Td> 500 km (311 mi) </Td> </Tr> <Tr> <Th> Area </Th> <Td> 77,600 km (29,962 sq mi) </Td> </Tr> <P> Dasht - e Kavir (Persian: دشت كوير ‎ ‎, lit .' Low Plains' in classical Persian, from khwar (low), and dasht (plain), flatland), also known as Kavir - e Namak (lit .' salty lowlands') and the Great Salt Desert, is a large desert lying in the middle of the Iranian plateau . It is about 800 km (500 mi) by 320 km (200 mi) with a total surface area of about 77,600 km (30,000 sq mi), making it the Earth's 26th largest desert . 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 </P> <P> Central in the desert lies the Kavir Buzurg (Great Kavir), which is about 320 km long and 160 km (99 mi) wide . In the west lies the Daryahcheh - e Namak ("salt lake"), of 1,800 km (690 sq mi). It contains some large salt plates in a mosaic - like shape . It is part of a 4,000 km (1,500 sq mi) protected ecological zone, the Kavir National Park . One of the most desolate places of Dasht - e Kavir is the Rig - e Jenn ("devil's dunes). </P>

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