Oghuz Turks found the Oguz Yabgu State in modern-day Kazakhstan
The Oguz Yabgu State was a Turkic state, founded by Oghuz Turks in 766, located geographically in an area between the coasts of the Caspian and Aral Seas. Oguz tribes occupied a vast territory in Kazakhstan along the Irgiz, Yaik, Emba, and Uil rivers, the Aral Sea area, the Syr Darya valley, the foothills of the Karatau Mountains in Tien-Shan, and the Chui River valley.