Khongoryn Els also called Duut Mankhan is popularly known as the "Singing Sands". It lies within the Gobi Gurvansaikhan National Park in Mongolia. The sand dunes extend to over 965 square kilometres area.
Wikipedia https://en.wikipedia.org/wiki/Khongoryn_Els
Address Mongolia
Coordinates 43°47'5.341" N 102°12'23.478" E