Which desert in China is famous for its 'singing sand' dunes?

The desert in China famous for its “singing sand” dunes is the Badain Jaran Desert. When dry sand avalanches down the steep, leeward face of one of its large dunes, it can produce a loud, sustained booming or humming sound.

Badain Jaran lies on the Alxa Plateau across Inner Mongolia, Gansu, and Ningxia. It covers about 49,000 square kilometres and is renowned for enormous stationary megadunes, some rising more than 500 metres from base to peak. More than 100 spring-fed lakes sit between the dunes, creating an unusually varied landscape.

The sound depends on highly specific conditions: dry, loose sand, a sufficiently steep slope, and the right grain size and packing. Humidity suppresses the effect, so the dunes are generally quiet in winter. “Singing sand” is not unique to China, but Badain Jaran is one of the world’s best-known examples. The Gobi is a broader desert region, while Badain Jaran is the specific desert named in this question.