Yueyaquan (Chinese: 月牙泉) is a crescent-shaped lake located in an Oasis which is around six kms south of the city of Dunhuang in Gansu Province, China. Yueyaquan was given in the Qing Dynasty. Mildred Cable & Francesca French visited the lake during their tour in this region and recorded their impresses in their book The Gobi Desert.
The average depth of the lake was 4 to 5 meters recorded in 1960, but now it is with a maximum depth of 7.5 metres (25 ft). In the early 1990s, its area had contracted to only 1.37 acres with an average depth of 0.9 meter (maximum 1.3 meter). In 2006, the local government started to fill the lake and reinstate its depth; its depth and size have been rising yearly since then. The lake and the nearby deserts are very famous with tourists, who offer them with a camel and 4×4 rides.
Crescent Spring is a unique and can be called as a natural wonder in the Gobi Desert. It look like a crescent fallen down into this desert. Having among there in sand dunes for thousands of years, though some attacks by sandstorms, Crescent Spring still burbles clear, and still remains praiseworthy as the first spring in the desert. As the cross-ventilated theory states, the dropping sands from the nearby mountains would be sent back to the other side of nearby Echoing-Sand Mountains. Thus, the sands do not overwhelm the spring. And this particular earth movement keeps the sand dunes and spring everlastingly in a melodious and almost impossible existence.