Demon City in Flower Sea is 80 kilometers north of Jiayuguan.It is a yadan-landform region region covering about 10 square kilometers. Here flooded and eroded by water and wind over thousands of years, the white clay-pan has formed some grooves and swelling,which seem like houses and castles or men and animals with various gestures and forms.They are SO strange and magnificent that it is called a Demon City by local people.