Khongoriin Els Sand DunesAlso known as the 'singing dunes', Khongoriin Els is a huge sand mass situated within the Gobi Gurvansaikhan National Park. The sand dunes here are 6 to 12km wide, 100 kilometres long and rise to a height of 260ft. And when the wind blows, a melodious sound is created. During the summer there is an oasis with stunning greenery around it as well. The oasis is called Khongor!