Two provinces of Mongolia are named after the Khangai mountains: Arkhangai (Northern Khangai) and Ovorkhangai (Southern Khangai). The mild climate area where the two provinces meet (eastern Khangai) is known as the cradle of Mongolian and nomadic civilization. The plains at the foot of the eastern Khangai host the Orkhon Valley World Heritage Site. The Xiongnu (209BC - 93AD) capital Luut Khot (Lungcheng), the Xianbei (93AD -234 AD) capital Ordo and the Rouran (330-555) capital Moomt (Mume) are said to have been located there. Later empires also established their capitals there, for example the Uyghur Empire (745-840) built their capital Ordu-Baliq in the region.