The border starts in the west at the tripoint with Syria at the confluence of Tigris river and Little Khabur river. It then follows the latter river eastwards, and then the Hezil Suyu river to the north-east. The border then turns eastwards overland via series of irregular lines over mountain crests and small streams, eventually turning southwards to connect to the Hajji Bak (Hacibey Suyu) river.