Orkhon
The Orkhon rises in the Khangai Mountains and flows north through the heart of Mongolia to join the Selenge. Its valley was a centre of successive steppe powers. The ruins of Ordu-Baliq, capital of the Uyghur Khaganate, stand along the river, as do those of Karakorum, the thirteenth-century Mongol capital. The Tuul and Tamir join the Orkhon before its waters continue towards Lake Baikal.