About 6 kilometers south of Dunhuang City, and surrounded by the Echoing-Sand Mountain, Crescent Moon Spring is a oasis in the desert. Crescent Moon Spring has been lying among the sand dunes for thousands of years. The formation of the lake resulted from a geological peculiarity - the north and south slopes are higher than the east and west - and from the wind which blows from west to east. The wind initially blows in a southeasterly direction, and is then forced upwards where it rotates spirally before finally retreating in an easterly direction. Thus, the sands do not smother the spring. The sand dunes and spring accompany each other eternally in a harmonious existence.