The Syr Darya, historically known as the Jaxartes, is a river in Central Asia. The name, which is Persian, literally means Syr Sea or Syr River. It originates in the Tian Shan mountains in Kyrgyzstan and eastern Uzbekistan, and flows for 2,256.25 kilometres (1,401.97 mi) west and north-west through Uzbekistan, Sughd province of Tajikistan, and southern Kazakhstan to the northern remnants of the Aral Sea. It is the northern and eastern of the two main rivers in the endorheic basin of the Aral Sea, the other being the Amu Darya.