Massive lines carved into a Peruvian desert reveal their shapes only from the sky

On a high, arid plateau in southern Peru, the ground itself has been drawn on. Straight lines run for miles across the desert, and among them are giant figures of animals, birds and human-like beings, all scraped into the earth more than a thousand years ago. From ground level they look like little more than shallow trails in the gravel. Rise a few hundred feet into the air, and the shapes snap into focus.

That contrast is the central fact of the site. The images were made large enough that no one standing among them could ever take in a whole figure at once, which is precisely why they went largely unrecognized until aircraft began crossing the region in the twentieth century. The lines have since become one of the most studied and most debated landscapes of the ancient Americas.

How the desert became a canvas

The technique behind the geoglyphs is deceptively simple. The desert floor is covered by a layer of reddish, iron-oxidized pebbles resting on lighter-colored soil, so removing the surface stones exposes a paler line beneath. By clearing narrow paths and larger shapes in this way, their makers created durable drawings without digging deep or moving much material. The protected desert landscape that holds them was inscribed as a World Heritage Site in 1994, recognizing both the lines and the related figures on the nearby Palpa plateau.

The images range from long straight lines and geometric spirals to instantly recognizable creatures, including a hummingbird, a monkey, a spider and a killer whale. They were made over a long span, generally dated from roughly 500 BC to 500 AD, by the Nazca and earlier Paracas cultures that lived in the region before the rise of the Inca. Their survival owes almost everything to climate: the plateau is one of the driest and least windy places on Earth, so the shallow markings have not been washed or blown away.

Why they can only be read from above

The scale is what forces the aerial view. Individual figures can stretch dozens of yards across, and the straight lines run for far greater distances, so the complete design of any given image simply cannot be perceived by a person walking through it. That has fueled a long argument over who the drawings were meant for and how their makers planned them without ever seeing the finished result from the sky.

Most researchers now favor explanations rooted in ritual and landscape rather than any single hidden message. Proposals have ranged from astronomical alignments and a giant calendar to markers tied to water sources and ceremonial processions, with the figures possibly walked as ritual pathways. The debate has never fully closed, and each new survey of the plateau tends to sharpen rather than settle it.

An AI survey nearly doubles the count

The catalog of known figures grew dramatically in 2024. A research team applied machine learning to high-resolution aerial imagery, flagging faint candidates that human experts then verified in the field, an effort described in a peer-reviewed study of the accelerated survey. In roughly six months of fieldwork the team confirmed 303 previously unrecorded figurative geoglyphs, nearly doubling a total that had taken close to a century to assemble.

The newly confirmed figures skew toward smaller, harder-to-spot relief-type images, many depicting people, domesticated animals such as llamas, and scenes of decapitated heads, as reporting on the discovery detailed. Their placement near winding footpaths suggested they were meant to be encountered up close by individuals or small groups, in contrast to the enormous line figures visible only from the air, hinting that the plateau served more than one purpose at once.

A monument that keeps expanding

Among the standout finds was a roughly 72-foot depiction of an orca clutching a knife, one of several striking images that captured attention when the results were published, according to coverage of the newly documented drawings. The mix of everyday subjects and violent imagery reinforced the idea that the geoglyphs were bound up with the social and ritual life of the people who made them, not simply decorative or astronomical.

The larger lesson is that the plateau is not a finished catalog but an expanding one. Faster survey methods keep revealing figures that eluded a hundred years of careful ground searching, which means the true number of geoglyphs remains unknown. What is certain is that the desert still guards more of these drawings than anyone has yet mapped, and that the full picture, in the most literal sense, can only be seen from above.

A fragile record under pressure

The same qualities that preserved the geoglyphs for two millennia also make them vulnerable. The markings are shallow, sometimes only inches deep, so a single set of footprints or tire tracks can scar a figure in ways that take centuries to fade, if they fade at all. Because the shapes are legible only from above, damage on the ground is often invisible to whoever causes it, which has made unauthorized intrusions a persistent threat to the site.

Human activity has repeatedly put the drawings at risk. Vehicles straying off designated roads, illicit development at the desert’s edge, and even a high-profile protest that left marks near one of the most famous figures have all drawn alarm from conservators. Climate poses a subtler danger, since the rare heavy rains that occasionally reach the normally bone-dry plateau can carve channels across the lines. Authorities restrict access and monitor the terrain from the air, but protecting a canvas the size of a small country, made of nothing more than rearranged pebbles, remains a continual challenge.

This article was produced with AI assistance and reviewed by Morning Overview editors.

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