By Daily Mail (U.S.) | Created at 2026-08-06 19:55:54 | Updated at 2026-08-06 22:24:35
2 hours ago
A vast engineering system beside one of ancient Egypt's oldest pyramids has offered a tantalizing new clue to how the iconic structures were actually built.
Two enormous structures buried beneath the sands have been uncovered near the Red Pyramid, stretching across an entire valley and resembling colossal dams rather than roads. The Red Pyramid is located roughly 15 to 25 miles south of Cairo.
For decades, the mysterious formations were interpreted as a stone-transport route and a natural rise in the landscape.
But a new study has argued that they formed part of a sophisticated hydraulic network designed to capture floodwater, trap sediment and regulate its flow.
The proposed system includes two dams, a reservoir, a diversion canal and what could be the earliest known advanced triangular spillway in ancient Egypt.
Researchers believe controlled water may have helped move heavy cargo near the pyramid while supplying workers, preparing mortar and protecting the construction zone from violent floods.
If confirmed, the discovery could reveal that Egyptians were mastering complex water engineering around 4,500 years ago as Pharaoh Snefru transformed Dahshur into a monumental building site.
However, the structures have never been excavated or securely dated, meaning their connection to the Red Pyramid remains an extraordinary but unproven theory.
Two enormous structures buried beneath the sands have been uncovered near the Red Pyramid, stretching across an entire valley and resembling colossal dams rather than roads
The Red Pyramid in Dahshur, Egypt, is approximately 4,600 years old.
It was built around 2590 BCE during the reign of the Old Kingdom pharaoh Sneferu of Egypt's Fourth Dynasty
The two formations cross Wadi Dahshur southwest of the pyramid, extending approximately 1,970 to 2,300 feet from one side of the valley to the other.
Pharaoh Sneferu is the father of Khufu, who commissioned the construction of the Great Pyramid.
Each newly identified system is anchored into the opposing slopes and has a broad, trapezoidal profile resembling an earth-and-rock embankment dam.
Topographic reconstructions indicate that the structures are approximately 49 to 98 feet wide at their bases and still stand around 20 to 23 feet above the present valley floor, despite much of the landscape being buried beneath windblown sand.
Their position provides one of the strongest arguments that they were intended to control water.
Rather than running along a natural travel route through the valley, both structures cut directly across its drainage path, precisely where barriers would be placed to slow or retain floodwater.
However, the structures have never been excavated or securely dated, meaning their connection to the Red Pyramid remains an extraordinary but unproven theory
Earlier researchers interpreted the eastern formation as a road used to transport limestone toward the Red Pyramid, while the western structure was sometimes dismissed as a natural rise.
The latest analysis published in Nature and led by Cairo University instead proposed that the two worked together as a two-stage water and sediment management system.
The upstream structure may have operated as a check dam, slowing sudden floods so rocks, sand and suspended sediment could settle before the water continued downstream.
Cleaner water could then have flowed toward the second formation, which may have served as the main retention dam.
The area between them would have created an intermediate reservoir covering approximately 21 acres and capable of holding an estimated 61 million gallons of water.
Because much of that basin is now filled with sand, the researchers said its original capacity may have been considerably greater and could have reached twice that estimate.
Temporarily holding the water between the dams would have reduced its destructive force, protected downstream channels from erosion and prevented them from quickly becoming clogged with sediment.
That protection would have been particularly valuable at Dahshur, where sudden floods could tear through soft limestone and marl terrain.
The most remarkable part of the proposed system sits at the center of the western structure.
Satellite images and historic aerial photographs reveal a large zigzagging or triangular section that the researchers said makes little sense as part of a road or transport ramp.
They identified it as a possible 'duckbill' spillway, an overflow structure designed to discharge more water than a straight barrier occupying the same width.
Two enormous structures buried beneath the sands have been uncovered near the Red Pyramid, stretching across an entire valley and resembling colossal dams rather than roads
Its triangular shape would have increased the total length over which water could escape, allowing the dam to release a much greater volume before the reservoir rose to dangerous levels.
The suspected spillway had a total crest length of approximately 656 feet and stood an estimated 13 to 23 feet high, with an opening angle of around 70 to 75 degrees.
Hydraulic calculations suggest that it could have released more than twice as much water as a straight spillway spanning the same section of the valley.
That added capacity would have reduced the risk of floodwater pouring uncontrollably over the top of the dam, a major cause of catastrophic failure.
No securely identified duckbill-style spillway has previously been documented in ancient Egypt.
If excavation confirms both its purpose and age, the Dahshur feature could represent an exceptionally early use of the engineering principle.
The design may also suggest that ancient Egyptian engineers were learning from disaster.
Sadd el-Kafara, widely regarded as one of the world's oldest large dams, lies less than 12 miles east of Dahshur and was constructed during roughly the same broad period.
It was ultimately destroyed by a powerful flood, and researchers have long suggested that it failed because it lacked a sufficient spillway to release extreme flows safely.
The proposed triangular spillway at Dahshur would have addressed that precise weakness by increasing discharge capacity, easing pressure on the dam and reducing the danger of water overtopping it.
The study cautiously raises the possibility that Egyptian engineers refined their understanding of flood control through experience, although there is no proof that the Dahshur builders were responding directly to the earlier failure.
The hydraulic system may also have included a long diversion canal running beside the Red Pyramid.
Historical surveys indicate that one straight section extended approximately 1,970 to 2,625 feet parallel to the monument's western side before turning east and passing within roughly 130 to 165 feet of it.
Its full route may have stretched for approximately 0.6 miles before reconnecting with an ancient wadi and the wider drainage network on the Nile side.
The canal was situated approximately 130 feet above the Nile Valley, meaning boats could not have sailed directly from the river to the pyramid and ramps would still have been needed to raise materials from lower harbors.
Once water reached the plateau, however, the researchers suggest that small barges or water-assisted sleds may have moved heavy cargo across relatively level ground.
The water could also have supplied workers and animals, been used to prepare mortar and helped suppress dust around the building site.
It may have served a defensive purpose as well by shielding the nearby Bent Pyramid causeway and harbor from flash floods and sediment buildup.
The researchers do not claim that water power or barges definitively built the Red Pyramid.
How ancient Egypt's iconic pyramids were built have long been a mystery, but a new study has suggested that dams were used to easily move material
Instead, they propose that water management formed one part of a broader logistical system supporting activity around the monument.
Although Dahshur is now a desert, the landscape was not always as dry as it appears today.
Paleoclimate evidence indicates that early Old Kingdom Egypt experienced more rainfall and greater environmental variability, allowing valleys that were dry for most of the year to carry powerful flows after intense storms.
The immediate Dahshur catchment was relatively small, but runoff may have been redirected from the much larger Wadi Taflah drainage system.
If that connection existed, it could have expanded the effective collection area from only a few square miles to at least 39 square miles—and potentially as much as 154 square miles.
The proposed network would not have created a permanent river.
Instead, it may have captured seasonal rain and short, violent flash floods, converting an unpredictable desert hazard into a controlled resource.
For now, the interpretation rests principally on satellite imagery, historical maps, aerial photographs, terrain models and hydraulic calculations.
Much of the site lies within a restricted military area, and archaeologists have never excavated the structures to establish who built them or when.
Researchers would need to uncover engineered cores, stone erosion protection, water-laid sediment or datable construction material to confirm the dam theory.
They must also determine whether the proposed canal was physically connected to the western structure.
Until then, it remains possible that the formations were created before the Red Pyramid, during its construction or centuries afterward.
