The Khabur River is the largest perennial tributary to the Euphrates in Syria it is 486 km long. Although the Khabur originates in Turkey, the karstic springs around Ras al-Ayn are the river\\\'s main source of water. Several important wadis join the Khabur north of Al-Hasakah, together creating what is known as the Khabur Triangle, or Upper Khabur area. From north to south, annual rainfall in the Khabur basin decreases from over 400 mm to less than 200 mm. This has made the river a vital water source for agriculture throughout history. The Khabur joins the Euphrates near the town of Busayrah.
The course of the Khabur can be divided into two distinct zones: the Upper Khabur area or Khabur Triangle north of Al-Hasakah, and the Middle and Lower Khabur between Al-Hasakah and Busayrah.
