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A jumbo wall dating back around 4,000 years has been let on surrounding an oasis in Saudi Arabia .

The wall was earlier 9 miles ( 14.5 km ) long and surrounded the Khaybar Oasis , located near the city of Al-‘Ula . It was about 16 feet ( 5 m ) high and 5.6 to 7.9 base ( 1.7 to 2.4 m ) fatheaded , the team said in astatement .

A reconstruction of a walled fortification with trees and fields in the center.

A reconstruction of what the fortification wall may have looked like.

The paries originally had 180 bastions , points projecting out of the fortification . Radiocarbon datingof charcoal remains found during excavations indicate that the wall date to between 2250 and 1950 B.C. , the squad wrote in a newspaper publisher published Jan. 10 in theJournal of Archaeological Science : Reports . Pottery remains on the rampart also hint that it go out to around that time . The bulwark may have been used for a few centuries before being abandoned .

Today , only about 3.7 mi ( 5.9 km ) of the 9 - mile wall and 74 of the 180 bastions stay on , the squad read in the statement .

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Part a wall discovered in Saudi Arabia.

Part of the wall with a bastion was found in Saudi Arabia.

Why were they built?

The rampart may have been constructed for several reasons . One likely purpose was military United States Department of Defense " against foray from nomads,“Guillaume Charloux , an archeologist with the French National Center for Scientific Research ( CNRS ) and lead writer of the paper , tell Live Science in an electronic mail .

In their paper , the scientist noted that the people who built the wall may have used it to delimit their dominion and to protect against flash floods . The squad noted that other model of bastioned oases have been found on the Arabian Peninsula and may be a signal that populations were becoming more sedentary .

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It would have charter 5.8 million cubic foot ( 164,000 cubic meter ) of Edward Durell Stone and brick and about 250 citizenry work for four years to build the paries , Charloux read .

an aerial view of an excavated fortress

work out in the Khaybar Oasis is on-going , and Charloux say we can expect to hear of result discussing a goodish settlement that survive in the Khaybar Oasis . There " is another important publishing to hail , " he say .

Before the excavations were carry , the internet site was break down using satellite resume . The work on the fortifications was carry out between 2020 and 2023 by researcher with the Khaybar Longue Durée Archaeological Project .

a group of people excavate a site with mountains behind them

a fragment of weathered papryus

A Digital Globe satellite showing part of the ancient Eridu canal network in 2006.

A sunrise over a grassy field with two white lines indicating a road drawn on the image

Remains of the Heroon, a small temple built for the burial cluster of Philip II at the Museum of the Royal Tombs inside the Great Tumulus of Aigai (Aegae)

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a close-up of a handmade stone tool

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Green carved scarab beetle in a gold setting and a gold chain

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Tunnel view of Yosemite National Park.

A scuba diver descends down a deep ocean reef wall into the abyss.

An artist�s illustration of a satellite crashing back to Earth.