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After decades of wild speculation, including theories of alien visitors, researchers using advanced aerial mapping now believe Peru's vast 'Band of Holes' was a sophisticated accounting system for the powerful Inca empire.

A riddle etched into the hills of Peru for centuries has finally been answered, not by treasure hunters, but by the precise lens of a drone. An international team of archaeologists has presented compelling new evidence suggesting the ‘Band of Holes’—a sprawling 1.5-kilometre line of over 5,000 pits in the Pisco Valley—was a monumental accounting system used to manage the Inca empire's economy.
This breakthrough, published in the journal Antiquity, counters years of speculation that ranged from giant water storage systems to landing strips for extraterrestrial craft. The new research provides the first hard data to support a theory grounded in the ingenuity of Indigenous Andean cultures, offering a vital insight into how ancient civilizations managed vast resources long before the digital age.
The breakthrough came when researchers, co-led by Professor Charles Stanish of the University of South Florida, employed high-resolution drone technology to map the entire site, known locally as Monte Sierpe or 'Serpent Mountain'. "Monte Sierpe is extremely difficult to map from the surface," Stanish noted, explaining that haze and the sheer scale of the site made it impossible to see the full pattern from the ground.
The aerial images revealed a stunningly deliberate design. The holes, each about one to two metres wide, are arranged in mathematically structured blocks and segments. Researchers argue this layout mirrors the 'khipus'—intricate knotted-string devices that served as the Inca's primary method for record-keeping and accounting. This suggests the entire mountainside may have functioned as a giant, open-air ledger.
The investigation didn't stop with images. Analysis of sediment from inside the pits uncovered microbotanical evidence of maize and reeds, plants used for making baskets to transport goods. This supports a two-phase history for the site:
This discovery is a powerful reminder of the sophisticated economic and social structures that governed life in the Andes. For Kenyans, it resonates with our own rich history, where complex trade routes and systems of governance existed long before colonial records. It underscores a universal story of human innovation in managing societies and their wealth.
"One of the benefits of scientific work is the debunking of unsubstantiated claims that in many ways deprive Indigenous peoples of rightful ownership of their past," Stanish emphasized. The team's findings restore the 'Band of Holes' not as a bizarre anomaly, but as a testament to the advanced capabilities of the Andean people.
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