The Sajur (Arabic: نهر الساجور, romanized: Nahr as-Sājūr [næhr æs sæːˈd͡ʒuːr]; Turkish: Sacır Suyu[1]) is a 108 kilometres (67 mi) long river originating in Turkey and flowing into the Euphrates in Syria.

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.

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.

In the western part of the drainage basin, flat grounds with fertile red-brown soils can be found, and this area is suitable for agriculture.

Toward the east and along the Sajur, the plain is dissected by numerous wadis, making these parts of the area less suitable for human occupation and agriculture.

[11] Occupation of the Sajur river basin started as early as the Lower Palaeolithic period, as evidenced by Acheulean stone artefacts.

This 45-metre (148 ft) high dam creates a reservoir with a surface area of 11 square kilometres (4.2 sq mi).

[15] A dam with a planned reservoir capacity of 0.0098 cubic kilometres (0.0024 cu mi) is under construction on the Syrian part of the Sajour.