Syr Darya (; ; ; , also transliterated Syrdarya or Sirdaryo)'s a river in Central Asia, sometimes known as the Jaxartes or Yaxartes from its Ancient Greek name ὁ Ιαξάρτης. The Greek name's derived from Old Persian, Yakhsha Arta ("Great Pearly"), a reference to the color of the river's water. In medieval Islamic writings, the river's uniformly known as Sayhoun (سيحون) - after one of the four rivers of Paradise. (Amu Dary… (More on Jaxartes)