The Amu Darya (from - Āmūdaryā, lit. "Amu River"), in antiquity known as Oxus (Ὦξος) to Greeks and Romans or Vaksu to Indo-Aryans, is a major river in Central Asia. It is formed by the junction of the Vakhsh and Panj rivers. In ancient times, the river was regarded as the boundary between Irān and Tūrān.B. Spuler, ĀMŪ DARYĀ, in Encyclopædia Iranica, online ed., 2009 Names The name Amu is said to have come from the city of… (More on Oxus)