[Jiuquan, July 20. A young girl climbs the Singing Sand Dunes near the Crescent Moon Spring on July 20, 2010 in Jiuquan of Gansu Province China]

The Crescent Moon Spring, named after its unique moon-like shape, is located at the north foot of the Singing Sand Dunes, about 50 meters (164 feet) from north to south and 5 meters (16 feet) deep on an average.