Nomadic empire
The Xiongnu were a confederation of nomadic tribes from Central Asia with a ruling class of unknown origin and other subjugated tribes. They lived on the Mongolian Plateau between the 3rd century BC and the 460s AD, their territories including modern day Mongolia, southern Siberia, western Manchuria, and the modern Chinese provinces of Inner Mongolia, Gansu, and Xinjiang. The Xiongnu was the first unified empire of nomadic peoples. Relations between early Chinese dynasties and the Xiongnu were complicated and included military conflict, exchanges of tribute and trade, and marriage treaties. When Emperor Qin Shihuang drove them away from the south of the Yellow River, he built the famous Great Wall to prevent the Xiongnu from coming back.
Xiongnu
Yap, apparently describing the early period, places the Chanyu's main camp north of Shanxi with the Tuqi King of the Left holding the area north of Beijing and the Tuqi King of the Right holding the Ordos Loop area as far as Gansu. Grousset, probably describing the situation after the Xiongnu had been driven north, places the Chanyu on the upper Orkhon River near where Genghis Khan would later establish his capital of Karakorum. The Tuqi King of the Left lived in the east, probably on the high Kherlen River. The Tuqi King of the Right lived in the west, perhaps near present-day Uliastai in the Khangai Mountains.