There is a small lake half-moon in shape in the Gansu Province of China. It is located only 6 kilometers to the south from a city of Dunhuang and would not be remarkable at any way except for it`s location. This lake, called Yueyaquan in Chinese, currently spreads itself 218 meters long and 54 meters wide in the middle of the Gobi desert, forming an oasis along the ancient Silk Route and has been known for 2000 years for its clear spring. For all this time the small oasis was kept in existence by a fragile natural balance.