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Khwarazm , or Chorasmia (Old Persian: "Uvârazmiya", , "Xwârazm" or "Xârazm"), is a large oasis region on the Amu Darya river delta in western Central Asia, bordered on the north by the (former) Aral Sea, on the east by the Kyzylkum Desert, on the south by the Karakum Desert, and on the west by the Ustyurt Plateau. It was the center of the Iranian Khwarazmian civilization, and a series of kingdoms such as the Khwarazmian dynasty and the Afrighid dynasty, whose capitals were (among others) Kath, Gurganj (modern Konye-Urgench) and – from the 16th century on – Khiva. Today Khwarazm belongs partly to Uzbekistan and partly to Turkmenistan.