Beneath the farmland and rising water table of Egypt’s Nile Delta, a team of researchers has identified something that shouldn’t be there: a circular temple structure at Bubastis, the ancient city where the cat goddess Bastet was venerated for more than two millennia. Circular religious buildings are virtually unknown in Egyptian architecture, which overwhelmingly favored rectangular and axial layouts. The few partial exceptions, such as the rounded granary-like structures documented at Elephantine and certain curvilinear Ptolemaic mammisi (birth-house) forms, only underscore how unusual a fully circular temple plan is in the Egyptian record. The discovery, revealed through subsurface electrical scanning rather than traditional excavation, also points to an elaborate network of water channels and basins that likely supported purification rituals tied to the Nile’s annual flood cycle.
The findings, drawn from peer-reviewed geoscience research published between 2019 and 2024, have gained renewed attention among Egyptologists in recent months. As of May 2026, no formal excavation of the circular structure has been announced, but the evidence already reshapes understanding of how sacred space was engineered in the Delta.
What the scans revealed
The primary evidence comes from a technique called Electrical Resistivity Tomography, or ERT. Researchers drive electrodes into the ground and send controlled electrical currents through the soil. Different materials resist that current in different ways: compacted stone blocks, waterlogged silt, and open voids each produce distinct signatures. By mapping those resistance patterns, scientists can reconstruct buried architecture without turning a single shovel of earth.
At Bubastis, ERT scans detected canal systems and stone-lined basins that decades of surface-level excavation had missed entirely. A study led by geoscientist Abdelrahman Ismail and colleagues, published in the Journal of Archaeological Science: Reports, details how these geoscience methods mapped sacred canals connected to the Temple of Bastet. The canals were not drainage infrastructure. They were purpose-built to channel Nile water into ritual spaces where priests performed cleansing ceremonies central to the religious calendar.
Geomorphological surveys added a second layer of confirmation, analyzing soil composition and sedimentation patterns shaped by centuries of Nile flooding. Together, the two methods painted a picture of a temple complex deliberately engineered around water access, with the circular structure sitting within that hydraulic landscape.
Water as sacred architecture
A separate body of academic work, published in the journal Water by MDPI, connects the physical infrastructure at Bubastis to ancient Egyptian texts describing water ceremonies in considerable detail. Ritual terms for purification, offerings to the inundation, and ceremonial processions along canal banks all appear in surviving documents. The research argues that both natural waterways and artificially constructed channels around Delta temples were ritually conceptualized as sacred spaces in their own right, functioning as extensions of the temple rather than utilitarian plumbing.
“The waterscape was not peripheral to the temple; it was integral to its sacred function,” the study’s authors write, describing how canal networks at Bubastis were maintained with the same care as the stone sanctuaries they served. Penelope Wilson, an Egyptologist at Durham University who has led fieldwork at nearby Delta sites, has noted in separate published commentary that water management infrastructure in the Delta “tells us as much about religious priorities as any inscription on a temple wall.”
This reframing matters for the circular structure. Its geometry may have been designed to guide the flow of water around or through a ritual space, creating a kind of enclosed sacred pool or channel loop. Rectangular temples typically move worshippers along a single axis from entrance to sanctuary. A circular plan could instead envelop participants in water on all sides, producing a fundamentally different ritual experience. That interpretation is architecturally logical, but it remains unproven until the interior of the structure is physically examined.
What remains uncertain
No published excavation report has confirmed the precise dating of the circular building. The Bubastis temple complex spans an enormous stretch of Egyptian history, from Old Kingdom construction around 2400 BCE through Ptolemaic-era renovations after 300 BCE. Placing the circular structure within that timeline is essential to understanding which religious traditions shaped its design. Without stratigraphic dating or artifact analysis from inside the building, its chronological position rests on inference from surrounding features.
The identity of the deity worshipped there is also unresolved. Bastet dominated religious life at Bubastis, but large temple complexes routinely included subsidiary shrines. The circular building could have been dedicated to Bastet, to a water-associated deity like Hapy (god of the Nile flood) or Osiris (whose mythology is deeply entwined with water and renewal), or to a generalized purification function that served multiple cults. Geophysical data alone cannot answer that question.
Official statements from the Egyptian Ministry of Tourism and Antiquities regarding the circular structure’s significance have not appeared in the peer-reviewed literature reviewed here. Institutional confirmation and plans for further excavation would strengthen the case considerably.
Three tiers of confidence
Readers following this story should keep three levels of certainty in mind. First, the existence of water infrastructure at Bubastis is confirmed by reproducible physical scanning data. ERT anomalies consistent with stone-lined channels and basins at specific depths are difficult to dispute. Second, the ritual use of that infrastructure is strongly supported by both the physical evidence and well-established textual sources from Egyptology. Third, the specific function of the circular structure as a water-rite venue is the least certain claim. It is supported by contextual evidence and architectural reasoning, but not yet by direct excavation of the building itself.
Why non-invasive scanning matters for the threatened Delta
The geoscience approach used at Bubastis carries significance well beyond a single site. Across the Nile Delta, rising groundwater levels, agricultural expansion, and urban development are threatening buried archaeological remains that have never been mapped. Traditional excavation is slow, expensive, and sometimes destructive. ERT and related scanning technologies allow researchers to document structures and water management systems without breaking ground, preserving fragile sites while still extracting data that would otherwise be lost.
For Bubastis specifically, the stakes are concrete. The site sits in the modern city of Zagazig, surrounded by development pressure. Non-invasive scanning may be the only realistic path to understanding the full extent of the temple complex, including the circular structure, before environmental and human forces erase what remains beneath the surface.
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*This article was researched with the help of AI, with human editors creating the final content.
