The Ustyurt Plateau, Ustyurt also spelled Ust-Urt and Usturt (Kazakh: Üstirt, Turkmen: Üstyurt), is a central Asian plateau in Uzbekistan and Kazakhstan, between the Aral Sea and the Caspian Sea. It extends roughly 200,000 km², with an average elevation of 150 meters, and consists primarily of stony desert.