A fragile survival
The Nazca Lines have lasted for roughly two thousand years or more because of where they are. The plateau of southern Peru is among the driest places on Earth, and winds near the surface are usually weak. The figures are made by moving dark surface stones aside to show lighter ground, so the lines are shallow and depend on the stable gravel around them. In most years nothing disturbs them. That same lightness makes them easy to damage, and a footprint or a tyre track can last for a very long time in such dry conditions.
The area is protected as a World Heritage Site, inscribed by UNESCO in 1994 as the Lines and Geoglyphs of Nazca and Pampas de Jumana. Protection on paper does not always mean protection on the ground, and the site covers a very large area, which is difficult to patrol.
Rain, flooding and erosion
Rain is rare, but it is not unknown. Occasional heavy rainfall, linked in some years to strong El Nino events, can send water across the plain. Because the surface has little vegetation to hold it, water can run in channels and wash away or blur lines and figures. Researchers have long worried about this, and a number of studies and management plans have considered how drainage could be diverted away from the most important designs. Reports differ about how much damage particular events caused, so it is wise to be cautious about precise claims.
Climate change may increase the unpredictability of rainfall in this region, but the effects at the site are not well quantified. The simplest conclusion is that the lines are vulnerable to even a few unusual weather events.
Roads, settlement and land pressure
Modern development is probably the larger and more constant threat. The Pan-American Highway, built through the area in the twentieth century, crosses part of the lines. In January 2018 a truck left the road and drove onto protected ground, damaging some of the markings, and the incident was widely reported in Peru.
Other pressures include:
- Informal settlement and land occupation on the edges of the protected zone, sometimes called squatting.
- Agricultural expansion and the digging of new irrigation channels.
- Mining concessions and quarrying in surrounding areas.
- Dust and vibration from heavy traffic.
Local authorities and the Peruvian Ministry of Culture have taken steps such as fencing, signage and monitoring, and have prosecuted some cases of damage. Enforcement across a site of hundreds of square kilometres is hard, and local people, many of whom live and work around the lines, need to be part of the solution. Heritage protection works better when it is accompanied by clear land rules and benefits for the neighbouring communities.
Tourists
Visitors are essential for the local economy, but they also create risk. Walking on the lines leaves marks that can persist. In 2014 activists from an environmental group entered a restricted area near the hummingbird figure to place a message, and left footprints that officials said could be seen afterward. The event led to stronger rules and to discussion about restricting access.
Most people see the lines today from a viewing tower beside the highway, from nearby hills, or on flights over the plain. Flights themselves are regulated, and there are concerns about vibration and about the safety of the aircraft. Controlled access and good information help to reduce harm, since most visitors do not intend to cause any.
Maria Reiche and early protection
Part of the story of protection began with Maria Reiche, the German-born mathematician who spent decades clearing and mapping the lines by hand, and whose Maria Reiche survey remains an important record. Her campaigning helped draw national attention in Peru. After her death in 1998, official responsibility passed increasingly to state institutions, and the work of conservation has become more systematic, with more attention to documentation.
New figures from the air and from data
Surveying has moved on a great deal. Drones now produce detailed images and elevation models that are far better than older aerial photographs, and the approach is related to the LiDAR survey methods used for archaeology elsewhere in the Americas. These images make faint lines visible, even where erosion or later disturbance has partly hidden them.
Two recent results show the effect:
- In 2020 the Peruvian Ministry of Culture announced a large cat figure on a hillside that had been cleared for the purpose of maintenance. It was described as belonging to an early phase, before the main Nazca period.
- In 2024, a team associated with Yamagata University in Japan reported the results of a survey that used machine learning, a type of computer pattern recognition, on aerial imagery, followed by checking on the ground. It reported more than 300 previously unrecorded figures, many of them small, and it was presented as roughly doubling the known total. Human specialists checked the candidates, which is important because software can easily mistake natural features for designs.
The new finds are mostly smaller than the famous Nazca animal figures, and the cat figure is thought to be older, a pattern that echoes the Palpa hillside geoglyphs to the north, where early figures sit on slopes. This helps to refine the picture of how the tradition developed, and it adds evidence to ideas that the figures had different purposes at different times. It also affects conservation, because every newly recorded figure is one more place that has to be mapped, monitored and protected.
What protection needs
A sensible reading of the situation is that the lines are neither doomed nor safe. Mapping each figure precisely, agreeing clear limits with the local community, keeping vehicles and people to defined routes, and preparing for rare rain are all practical steps. Better records also protect scholarship: if a design is damaged, a careful survey means that its shape is still known. The Nazca Lines have survived many centuries, and what happens in the next few decades will depend mostly on management choices.