The Sajur River ( ; ) is a long river originating in Turkey and flowing into the Euphrates in Syria. It is the smallest of the three rivers joining the Euphrates in Syria, and the only one that joins the Euphrates on its western bank. Occupation in the Sajur basin started in the Lower Palaeolithic period and continues until today. Course The Sajur River is long, of which in Turkey and in Syria. It is thought to originate in a place to the west of Gaziantep, called Sacır Başı in Turkish. Its name changes to Kavaklık deresi in the historic outskirts of Gaziantep, then to Alleben deresi in the old town, and later to Tabakhane deresi ( tannery stream). As it leaves the old town dirty, it becomes Kara Akar ( black-flowing), regaining its original name Sajur shortly after. From there, the Sajur flows southeast until it crosses the Syria–Turkey border. The river then continues in a roughly easterly direction until it joins the Euphrates on its right bank in the area that is flooded by the Tishrin Dam reservoir. In Syria, the river cuts a valley into the Manbij Plain that is between below the level of the plain, and up to wide. Average discharge is per second. Maximum discharge, occurring in the months February and March, is per second, while minimum discharge, recorded for June–October, is per second. Average annual discharge is . Both in terms of length, as well as discharge, the Sajur is the smallest of the three rivers that join the Euphrates on Syrian soil – the other two being the Balikh and the Khabur. The Sajur is also the only river in Syria that enters the Euphrates on its right bank; both the Balikh and the Khabur flow into the Euphrates on the left bank. Drainage basin The Sajur drains a total area of . The Syrian part of the Sajur basin – the Manbij Plain – has been particularly well-studied. This area is bounded on the north by the Syro–Turkish border and extends as far south as Manbij. To the west, the Manbij Plain is bordered by basalt outcrops; probably the remains of a Pliocene volcano. In the southeast of the plain, limestone outcrops force the Euphrates into the gorge of Qara Quzaq. These outcrops reach a height of over the plain. Reaching heights of amsl in the north, west and south, the