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Archaeologists have identified a prehistoric ditch-and-rampart defense at Oued Beht in north-western Morocco, dating it to roughly 3,500–4,000 years ago. The substantial stone wall visible at the site is medieval, not prehistoric: the ancient earthwork lies beneath it. Researchers describe the ditch and rampart as the oldest defensive structure currently identified in North Africa outside the Nile Valley.
What was found at Oued Beht?
Oued Beht is a settlement on a ridge overlooking the Oued Beht watercourse. During the project’s third field season, archaeologists investigated defensive features that had been noted decades earlier. Beneath later masonry, they identified a broad ditch and an earthen rampart. The Italian Ministry of Foreign Affairs and International Cooperation announced the finding on September 15, 2026, describing the earthwork as about 3,500–4,000 years old. The ministry’s announcement calls it the oldest defensive structure currently identified in North Africa outside the Nile Valley.
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That distinction is about the evidence identified so far, not a claim that no older defense could ever be found. The published age is a range, not an exact construction year, and available reports do not give measurements for the ditch or rampart.
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Why the “wall” is not 4,000-year-old stone masonry
The headline’s “wall” refers to a defensive system, but its prehistoric components were a ditch and earthen rampart. The imposing stone wall standing above the rampart belongs to a later, medieval phase, alongside a cemetery from that period. The CNR account distinguishes these successive uses of the site. The medieval masonry should not be mistaken for the ancient defense.
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How researchers dated and interpreted the defense
Radiocarbon dates refine the sequence
Italy’s National Research Council (CNR) reports that 17 new radiocarbon dates helped researchers reconstruct the construction sequence and refine the chronology. The resulting estimate places the ditch-and-rampart system in the early-to-mid second millennium BC, or roughly 3,500–4,000 years ago. Radiocarbon dating supports a period of construction; it does not establish a precise year.
The ridge shaped the barrier
The CNR says the defensive system closed off the settlement’s southern end and made use of the ridge’s natural shape. Its position and form support the interpretation of a barrier designed to defend or control access, but they do not identify a particular enemy or threat.
Purpose remains uncertain
Researchers do not know exactly what the inhabitants were protecting themselves from. In reporting by Live Science, project co-director Giulio Lucarini said the cause is unknown and raised competition over land and resources, control of movement, and more formal leadership as possibilities. These are hypotheses, not established explanations for the construction.
A defensive phase in a much older settlement
Oued Beht was occupied long before the newly identified defense. CNR describes an approximately 10-hectare farming settlement dating from the middle of the fourth to the beginning of the third millennium BC—well before the ditch and rampart. It reports connections between the farming community and the Iberian Peninsula. The ten-hectare figure describes the settlement, not the size of the fortification.
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A separate account of the site describes livestock, cultivated crops, and numerous bell-shaped pits thought to have stored grain. Researchers have suggested that the storage capacity may have served a wider community, but that interpretation remains tentative. Live Science’s coverage discusses this earlier farming context.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the discovery adds to North African archaeology
The scale and placement of the earthwork show that communities in the north-western Maghreb could organize substantial collective construction by the early-to-mid second millennium BC. Lucarini, an archaeologist at CNR ISPC and ISMEO and a project co-director, described the work as evidence of major projects carried out collectively. That conclusion demonstrates local capability; by itself, it does not prove a specific political system, organized enemy, or cause of conflict.
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The findings are reported in an open-access paper in Libyan Studies, produced through collaboration among Morocco’s National Institute of Archaeological and Heritage Sciences (INSAP), Italy’s National Research Council (CNR), ISMEO, and the University of Cambridge. The project’s co-directors are Giulio Lucarini, Cyprian Broodbank, and Youssef Bokbot. The CNR release links to the article.
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