There were thousands of mysterious holes lined up in Peru. We didn’t know why until a drone saw them from the air

In the arid hills of Pisco Valleyin the south of Peru, extends a monument as mysterious as it is precise: a strip of almost a kilometer and a half made up of some 5,200 perfectly aligned cavities, known like Mount Sierpe or the Band of Holes. Discovered in 1931 by the geologist Robert Shippee and Lieutenant George R. Johnson during one of the first aerial expeditions over the Andes, the site baffled generations of archaeologists.

Until now.

A mysterious landscape. For decades, theories were proposed ranging from its defensive use to fog capture or water storage, but none of them quite fit.

Now, a new study published in Antiquity provides a convincing hypothesis from a point of view that no one had valued: from the air. In this way, Mount Sierpe would have functioned as a accounting and barter system on a large scale, a kind of “spreadsheet” of the pre-Hispanic Andes.

The geometry that speaks. The international team of researchers, led by archaeologist Jacob Bongers from the University of Sydney, used drones to map the site with millimeter precision. Aerial images revealed an organized structure into about 60 blocks or sections, each with distinct alignments and regular number patterns.

Some areas show rows of nine by eight holesothers alternate between groups of seven and eight. This internal order, absent any defensive or agricultural logic, suggests an administrative purpose. Sediment analyzes extracted microscopic remains corn, totora and willow (plants traditionally used to make baskets and mats), which suggests that the cavities were lined with plant fibers and were used to store goods, possibly in packages or braided baskets.

The holes of Mount Sierpe

From local barter to administration. Researchers believe that Monte Sierpe was born as a space for exchange between highland and coastal communities, an organized market for balance the flow of goods in the absence of currency. Products (for example, corn, coca or cotton) could be deposited in each cavity as a visible representation of the value of one good compared to another, allowing quantities to be compared in a public and transparent manner.

Centuries later, with the expansion of inca empirethat system would have been reinterpreted and expanded as an accounting tool to manage the tribute of local populations. Each block of holes would have corresponded to a different community group, and the variations in number and arrangement would reflect the contribution levels or work shifts required by the Inca State. In essence, Monte Sierpe would have been a physical data recorda stone matrix destined to organize the unwritten economy of the Andean world.

A carved khipu. The most revealing finding is the similarity between the structure of the site and the Inca khipusthe rope systems with knots used to record censuses, taxes or resources. One of the khipus found near Pisco presents around 80 groups of lacesa figure surprisingly close to the 60 segments of Monte Sierpe.

This correspondence suggests that the Band of Holes could have been a three-dimensional khipua monumental version of that woven numerical language, designed to coordinate the flow of goods and work between communities. Unlike the tablets or inscriptions of other civilizations, the Andean peoples turned geography itself into a support for information.

Code in the desert. If you also want, Monte Sierpe redefines our understanding of pre-columbian organizational intelligence. Without writing, without currency and in a hostile environment, Andean societies managed to develop a visual, modular and mathematical method to represent their economy. Each hole would have been a cell a great living recordmanaged collectively, perhaps accompanied by ceremonies or ritual exchanges.

Thus, in its apparent geometric simplicity, this “spreadsheet” carved into the rock reveals a advanced economic systembased on reciprocity and communal control of resources. What for the first explorers were simple rows of holes now emerge as the physical testimony of a civilization that, centuries before European contact, had already found its own way of turning the landscape into memory.

Image | JL Bongers

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