1 / 3   Yueya Spring, also known as Crescent Moon Spring near Dunhuang in northwest China’s Gansu Province, is surrounded by the Mingsha Sand Mountains and has long been a popular tourist destination. /Chinanews Photo

2 / 3   After a series of renovation projects carried out since 2016, Yueya Spring maintains a stable water level of between 1.35 to 1.5 meters, meaning it never dries out. /Chinanews Photo

3 / 3   At the beginning of the 20th century, Yueya Spring was reportedly deep enough to be able to hold a ship. However, since the mid-1970s, the water level has reduced due to aridity and excessive use of underground water. /Chinanews Photo