Have you ever heard of a mountain that echoes to the sound of sand as you slide down its slopes? Can you image a perennially limpid lake in an area of desert sand? Here in Dunhuang, Gansu Province, you will have the chance to enjoy the wonderful spectacle of the Echoing-Sand Mountain. The mountain is five kilometers (about three miles) away from the city of Dunhuang. Seen from afar, the mountain is just like a golden dragon winding its way over the horizon. As you approach you become aware that the sand has many colors ranging from red to yellow, green, black and white.