The Oguz Yabgu State (Oguz il, meaning Oguz Land, Oguz Country)(750-1055) was a [[Turkic people|Turkic]] state, founded by [[Oghuz Turks]] in 766, located geographically in an area between the coasts of the [[Caspian Sea|Caspian]] and [[Aral Sea]]s. Oguz tribes occupied a vast territory in [[Kazakhstan]] along the [[Irgiz River (Kazakhstan)|Irgiz]], [[Yaik]], [[Emba River|Emba]], and [[Uil River|Uil]] rivers, the Aral Sea area, the [[Syr Darya]] valley, the foothills of the [[Karatau Mountains]] in [[Tian Shan|Tien-Shan]], and the [[Chui River]] valley (see map). The Oguz political association developed in the 9th and 10th centuries in the basin of the middle and lower course of the Syr Darya and adjoining the modern western Kazakhstan steppes.