锡尔河
At the beginning of the 9th century the Oghuz confederation, in alliance with Karluks and Kimaks destroyed the Kangar Union and captured the lower course of the Syr Darya river and the Aral steppes, displacing the Kangars and Pechenegs. The nomadic tribes of the Syr Darya Kangars were forced to join the Oghuzes, and a part of them migrated to the west to the northern Black Sea region. The Oghuzes moved their capital to Yangikent and became known as Oghuz Yabgu State.