Archaeologists working at Oued Beht in northwestern Morocco have uncovered North Africa’s oldest known defensive system outside the Nile Valley, consisting of a large ditch and an earthen rampart built approximately 3,500 to 4,000 years ago. According to the Oued Beht Archaeological Project, the discovery resolves a mystery that persisted since the 1930s and proves that prehistoric communities in the Maghreb were capable of organizing complex, large-scale construction projects.
Uncovering the Oldest Defensive System in the Maghreb
The newly investigated structure sits on a ridge above the river that gives the site its name in Khémisset Province, according to fieldwork data. Researchers from Morocco, Italy, the United Kingdom, and other institutions investigated the linear walls during the third field season of the Oued Beht Archaeological Project, or OBAP, which took place in October and November 2023. The findings appear in the journal Libyan Studies, as detailed by the Italian Ministry of Foreign Affairs.
French archaeologist Armand Ruhlmann originally documented a configuration of three walls at the location in the 1930s. However, their precise nature and chronology remained uncertain for nearly a century until recent excavations revealed a broad ditch and an earth embankment beneath a visible stone structure.
Did you know? Seventeen new radiocarbon dates helped researchers establish the construction sequence, placing the earthworks in the second millennium BCE—a period not previously confirmed at Oued Beht.
Comparing Oued Beht With Bronze Age Iberia
During the second millennium BCE, the western Mediterranean saw widespread social transformations. According to project researchers, contemporary El Argar communities in southern Iberia built fortified settlements, developed advanced metallurgy, and established marked social hierarchies.
The defensive works at Oued Beht indicate that northwestern Africa was not isolated from these broader regional networks. The scale of the construction points to growing competition over resources, control of movement, and more formalized leadership structures among local communities.
Multi-Period Settlement and Medieval Reoccupation
The site’s history spans thousands of years of human activity. Earlier excavations led by the project revealed a large Final Neolithic settlement covering about 10 hectares that dates from the middle of the fourth to the early third millennium BCE, featuring farming communities with links to the Iberian Peninsula.
Over time, settlement strategies shifted. While earlier Neolithic activity focused on a larger, open northern area, builders later utilized the natural shape of the rocky southern spur to construct stronger defenses. Centuries after the prehistoric site was abandoned, the ridge saw renewed use during the medieval period between the 11th and 13th centuries AD, when communities rebuilt the defensive wall, established a nearby hamlet, and placed a cemetery between the two zones.
Frequently Asked Questions
Where is the Oued Beht archaeological site located?
Oued Beht is located in the hills of northwestern Morocco, overlooking the river of the same name in Khémisset Province.
How old is the newly discovered defensive wall?
Radiocarbon dating places the construction of the ditch and rampart system between 3,500 and 4,000 years ago, corresponding to the early-to-mid second millennium BCE.
Who directs the Oued Beht Archaeological Project?
The project is a collaboration between institutions including Morocco’s National Institute of Archaeology and Heritage Sciences (INSAP), the National Research Council (CNR), and ISMEO (International Association for Mediterranean and Oriental Studies).
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