The Rig Jenn is a vast area of sand dunes in the middle of Dasht-e Kavir , Iran's central desert in the border region of the Semnan and Isfahan provinces . It was not travelled by the old caravan travelers , who believed it is a place where evil spirits live . Even today some in the neighbouring towns and villages believe this . Sven Hedin , the famous desert explorer avoided this area in his 1900s explorations to Iranian deserts .
The Austrian geographer Alfons Gabriel crossed the southern 'tail' of it on his way from Ashin to Aroosan in the 1930s .