Cairo’s Mamluk Aqueduct Finally Gives Up Its Missing Stage

The joint Egyptian-French mission excavating the districts around Cairo’s Citadel of Saladin announced on June 6, 2026, that it has uncovered the long-missing final stage of Sour Magra El-Oyoun, the medieval Mamluk aqueduct network that supplied the fortress for over five centuries. Two stone wells, four waterwheel structures, and a web of stone channels in the Arab al-Yasar district give physical form to a stretch of the system that, until this week, existed only as a gap in the written historical record.

The mission is run jointly by Egypt’s Supreme Council of Antiquities (SCA) and the Institut français d’archéologie orientale (IFAO), the French Institute for Oriental Archaeology based in Cairo since 1880. The find covers two adjoining districts: Arab al-Yasar, where the water infrastructure came to light, and the neighbouring al-Hattaba, where a Mamluk-era mosque, a burial chamber, and a substantial cache of artifacts were recovered.

The Section History Missed

Historians have long known how Sour Magra El-Oyoun worked at its two anchor points. At the Nile, the hexagonal intake tower at Fumm al-Khalig housed the waterwheels that raised river water to an elevated stone channel running east across Cairo. At the Citadel, water arrived at a reservoir in the southern enclosure, the Bi’r al-Sa’b Sawaqi (the Well of the Seven Waterwheels), and dispersed from there through underground pipes to the fortress’s mosques, palaces, and gardens. The middle section was roughly three kilometres of limestone arches, still standing today, running alongside a modern Cairo street that carries the aqueduct’s name. The system is catalogued as one of the finest surviving examples of Islamic hydraulic architecture in the Discover Islamic Art museum database.

What the medieval chronicles left out was the terminal mechanics: how water moved from the foot of the Muqattam Hills up into the Citadel itself. Arabic historical writing about Mamluk infrastructure tended to document the grand architectural elements, the intake tower, the elevated channel, the reservoir inside the walls. The wells, waterwheel hardware, and animal facilities that completed the system’s last stage at the Citadel end went essentially unrecorded. Functionally, this terminal stage was the most labour-intensive point in the network: the final lift before water entered the Citadel required more mechanical intervention and more animal-power management than any other stage. What royal patrons commissioned and what court historians celebrated were the grand engineering works visible to the city, not the working yards at its base.

The discovery appears to identify, for the first time, the final stage of the aqueduct’s hydraulic system, a section that has not been documented in surviving historical sources.

Mohamed Ibrahim, Associate Professor of Islamic Archaeology at Ain Shams University and Mission Director, told reporters in Cairo on June 6.

What Arab al-Yasar Gave Up

Two Wells and Four Wheels

The structural core of the find is a pair of stone wells. One reaches approximately ten metres into the ground; the other, eight metres. Both sit at the base of the slope the Citadel occupies, sunk to catch groundwater before it could be lifted further. Alongside them: the remains of four waterwheels and an extensive network of stone channels carrying water upward toward the Citadel walls. Preliminary studies suggest the system dates to the reign of Sultan al-Nasir Muhammad ibn Qalawun, who overhauled the aqueduct in 1311 or 1312 as part of the construction programme that remade the Citadel at its Mamluk peak.

A newly identified stone channel extends west from the main excavated structure toward what researchers believe was the Citadel’s royal stable complex. If that connection is confirmed, it revises how historians understand water distribution inside the fortress grounds, including the supply to the animals that powered the mechanical lifting equipment itself.

The Operation’s Footprint

The excavation recovered more than masonry. Animal tracks, stable remains, fodder storage areas, water basins, and stone-paved work surfaces came up in the same layer as the wells and channels. These are the physical traces of the ox-teams that powered the waterwheels, the handlers who managed rotation schedules, and the provisioning arrangements that kept the animals working. Medieval waterwheel towers of this type relied on cattle walking set circuits to drive the mechanical gearing. The site now provides material evidence for how that operation was organised at the critical final stage, where the physical record was previously empty.

Simon Connor, Scientific Member at IFAO and Co-Director of the French Mission, said the team is applying high-precision photogrammetric documentation while digitizing all findings into a comprehensive spatial database. Photogrammetry converts overlapping photographs into precise three-dimensional models, preserving spatial relationships the physical excavation otherwise disrupts. That database becomes the baseline for any future conservation work at this end of the aqueduct, a critical resource in a densely built urban environment where the dig site cannot remain open indefinitely.

• Two stone wells: approximately 10 metres and 8 metres deep
• Structural remains of lifting equipment and an extensive stone channel network
• A westward-running channel toward the probable location of the royal stables
• Animal tracks, stable remains, fodder storage, water basins, and stone-paved work surfaces confirming operational use

From Nile to Citadel

The aqueduct’s origins trace to Saladin’s 12th-century defensive wall, where a basic canal carried Nile water to the early Citadel. Sultan al-Nasir Muhammad ibn Qalawun commissioned the system’s major overhaul in 1311 or 1312: a new hexagonal intake tower at Fumm al-Khalig with four large waterwheels, a second relay tower with three more wheels midway along the route, and the elevated channel archaeologists still walk beside today. The water volume his expanded system delivered let him carry out the construction programme that defined the Citadel at its Mamluk peak, including the mosque still bearing his name and the Qasr al-Ablaq, a striped-stone palace that became the court’s main ceremonial space. His construction programme inside the Citadel depended on that expanded supply to serve the growing population of soldiers, officials, and their households within the walls.

Before the aqueduct, Saladin had dug the Bi’r Yusuf inside the Citadel, a spiral siege well designed to provide water if external supply was cut. That well remained the fortress’s emergency reserve long after the aqueduct came online. The discovery at the terminal section documents the other supply track: the daily water that kept the Citadel running in ordinary time.

Two later sultans extended the system’s life. Qaytbay made major structural repairs in 1480. Al-Ghuri rebuilt the Nile intake tower between 1506 and 1508, raising the wheel count from four to six and placing his emblem on the tower walls. The system stayed in service through the Ottoman period. Napoleon’s forces converted the intake tower into a military fort in 1798, blocking its arches, and by 1801 the network had stopped running. Egypt’s Ministry of Tourism and Antiquities restored the intake tower in 2023, cleaning the stonework and reinforcing the structure before opening it for public visits. That restoration covered the tower’s visible above-ground fabric. A 2021 peer-reviewed study on the Magra al-Ayoun corridor, published in the International Journal of Management Sciences and Arts and Communication, described the structure as one of Cairo’s most prominent historical Islamic monuments and called for its integration into a heritage revival project. The terminal section was, at that point, still unexcavated.

Al-Hattaba’s Religious Layers

The second dig site is a short distance from the water system excavation and produced a structurally different kind of find. A Mamluk-era mosque, its mihrab intact, with sections of the qibla wall and stone flooring preserved, sits alongside a burial chamber and tombs dating to different Islamic periods. In Mamluk urban planning, mosques routinely served as neighbourhood anchors, combining prayer with charitable activities and sometimes formal education. The mosque at this site would have centred the community living and working near the Citadel’s supply infrastructure.

The burial chamber and its associated tombs, spanning different Islamic periods, point to a neighbourhood that retained funerary significance through the transitions from Mamluk to Ottoman governance and into the later centuries. Finding a mosque and burial ground alongside the water infrastructure shifts the picture of the area from a purely functional zone to a settled, socially integrated neighbourhood. The Mamluk period, during which the Citadel became the permanent seat of the sultanate, was one in which the districts immediately below and around it filled with mosques, markets, and residential quarters serving the complex’s population.

The artifact haul from across both sites:

• Ceramic qawadis: vessels designed for use in waterwheel lifting mechanisms, found at the water system site and confirming its operational function
• Mamluk- and Ottoman-era coins: currency evidence spanning at least four centuries of the neighbourhood’s commercial life
• Jewellery and metal seals: personal objects and administrative marks from residents and officials
• Weapon fragments: dated to the 18th and 19th centuries, placing them in the late Ottoman and French-occupation periods

The qawadis are operationally precise. Their design is specific to waterwheel lifting equipment, shaped to fit the scooping mechanism that transferred water from one level to the next. Finding them at the waterwheel site rounds out the case for what the stone channels and wells were doing. Sherif Fathy, Egypt’s Minister of Tourism and Antiquities, called the combined finds a “qualitative addition” to understanding the Citadel’s history across Islamic periods.

Documenting the Find

Pierre Tallet, Director of the IFAO, told reporters the joint programme is a model of cooperation specifically in Islamic-period archaeology, a field that draws proportionally less international excavation funding than Egypt’s pharaonic sites. The institute, operating from Mounira Palace in central Cairo since 1907, currently runs around thirty excavation programmes covering every period of Egyptian history from prehistory through the Islamic era, spread across the Nile valley, Delta, and desert regions.

The embedded field school runs as a parallel track inside the dig. SCA inspectors learn photogrammetric documentation and modern excavation techniques from the institute’s specialists while working both sites. The SCA, established in 1994 to oversee Egypt’s archaeological excavations and conservation work, gains technical expertise through the arrangement that stays within Egyptian institutions after the joint mission’s formal phases end.

Egypt’s Ministry of Tourism and Antiquities has positioned the broader rehabilitation project as an effort to connect the documented archaeology of Historic Cairo, proclaimed a UNESCO World Heritage Site in 1979, to the country’s cultural-tourism economy. Archaeologists are continuing to excavate at the water system site in search of lower storage cisterns: the underground chambers that would have held water in reserve before it entered the Citadel’s internal pipe network to supply its buildings.