Tongwancheng was the capital of the Xia Kingdom, founded by the Xiongnu people at the southern edge of the Maowusu Sands of the Ordos Desert, in present-day Inner Mongolia
Jiaohe, also called Yarkhoto and Yarghul is an ancient ruined city and fortress, located on a land plateau shaped like a willow leaf in the Xinjiang Uyghur Autonomous Region of China.