The Rig-e Jenn is a vast area of sand

Sand

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.The composition of sand is highly variable, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal...

 dune

Dune

In physical geography, a dune is a hill of sand built by wind. Dunes occur in different forms and sizes, formed by interaction with the wind. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind...

s in the middle of Dasht-e Kavir

Dasht-e Kavir

Dasht-e Kavir , also known as Kavir-e Namak or Great Salt Desert is a large desert lying in the middle of the Iranian plateau. It is about 800 kilometers long and 320 kilometers wide with a total surface area of about 77,600 square kilometers , making it the Earth's 23rd largest desert...

, Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

's central desert

Desert

A desert is a landscape or region that receives an extremely low amount of precipitation, less than enough to support growth of most plants. Most deserts have an average annual precipitation of less than...

 in the border region of the Semnan

Semnan Province

Semnan Province is one of the 31 provinces of Iran. It is in the north of the country, and its center is Semnan. The province of Semnan covers an area of 96,816 square kilometers and stretches along the Alborz mountain range and borders to Dasht-e Kavir desert in its southern parts.Counties of...

 and Isfahan provinces. It was not travelled by the old caravan

Caravan (travellers)

A caravan is a group of people traveling together, often on a trade expedition. Caravans were used mainly in desert areas and throughout the Silk Road, where traveling in groups aided in defence against bandits as well as helped to improve economies of scale in trade.In historical times, caravans...

 travellers, who believed it is a place where evil spirits live. Even today some in the neighbouring towns and villages believe this. Sven Hedin

Sven Hedin

Sven Anders Hedin KNO1kl RVO was a Swedish geographer, topographer, explorer, photographer, and travel writer, as well as an illustrator of his own works...

, the famous desert explorer avoided this area in his 1900s explorations to Iranian deserts. Alfons Gabriel

Alfons Gabriel

Alfons Gabriel was an Austrian geographer and travel writer who made several trips to the deserts of Iran, during 1927-8, 1933, and 1937. Gabriel wrote five books about his trips and findings...

 crossed the southern 'tail' of it on his way from Ashin to Aroosan in the 1930s.