The Karasu ( Arabic: قره صو) or Aswad ( Arabic: الأسود) is a river in the provinces of Gaziantep and Hatay in Turkey. For part of its length it forms the border with Aleppo Governorate in Syria. [1] It joins the Afrin River at the site of the former Lake Amik. Its waters now flow to the Orontes by a canal. [2]