In the Syrian steppe, a very long wall of over 220 km long was discovered east of Hama, drawing an arc facing to the east. Built in dry stone with local materials, it has an average width of 0.8 to 1.1 m and a height that was not exceeding 1 m or 1.5 m. The wall separates the area that is potentially exploitable by sedentary farmers from the one used by pastoralists. Considered going back to the Early Bronze Age IV, it seems to be a delineation of a limit, and not a defensive structure, marking the eastern border of the kingdoms of Hama or Ebla in the Fertile Crescent at the end of the 3rd millennium. We would therefore have the oldest materialization of a territorial boundary that is currently known to us.Dans la steppe syrienne, à l’est d...