The Nazca lines are a group of over 700 geoglyphs made in the soil of the Nazca Desert in southern Peru. They were created between 500 BC and 500 AD by people making depressions or shallow incisions in the desert floor, removing pebbles and leaving different-colored dirt exposed. There are two major phases of the Nazca lines, Paracas phase, from 400 to 200 BC, and Nazca phase, from 200 BC to 500 AD. In the 21st century, several hundred new figures had been found with the use of drones, and archaeologists believe that there are more to be found. Most lines run straight across the landscape, but there are also figurative designs of animals and plants. The combined length of all the lines is more than 1,300 km (800 mi), and the group covers an area of about 50 km2 (19 sq mi). The lines are typically 10 to 15 cm (4–6 in) deep. They were made by removing the top layer of reddish-brown ferric oxide–coated pebbles to reveal a yellow-grey subsoil. The width of the lines varies considerably, but more than half are slightly more than 33 cm (13 in) wide. In some places they may be only 30 cm (12 in) wide, and in others reach 1.8 m (6 ft) wide. Some of the Nazca lines form shapes that are best seen from the air (at around 500 m [1,600 ft]), although they are also visible from the surrounding foothills and other high places. The shapes are usually made from one continuous line. The largest ones are about 370 m (400 yd) long. Because of its isolation and the dry, windless, stable climate of the plateau, the lines have mostly been preserved naturally. Extremely rare changes in weather may temporarily alter the general designs. As of 2012, the lines are said to have been deteriorating because of an influx of squatters inhabiting the lands. The figures vary in complexity. Hundreds are simple lines and geometric shapes; more than 70 are zoomorphic designs, including a hummingbird, arachnid, fish, condor, heron, monkey, lizard, dog, cat, and a human. Other shapes include trees and flowers. Scholars differ in interpreting the purpose of the designs, but in general, they ascribe religious significance to them. They were designated in 1994 as a UNESCO World Heritage Site.
The high, arid plateau stretches more than 80 km (50 mi) between the towns of Nazca and Palpa on the Pampas de Jumana, approximately 400 km (250 mi) south of Lima. The main PE-1S Panamericana Sur runs parallel to it. The main concentration of designs is in a 10 by 4 km (6 by 2 mi) rectangle, south of the hamlet of San Miguel de la Pascana. In this area, the most notable geoglyphs are visible.
Determining how they were made has been easier than determining why they were made. Scholars have theorized that the Nazca people could have used simple tools and surveying equipment to construct the lines. Archaeological surveys have found wooden stakes in the ground at the end of some lines, which supports this theory. One such stake was carbon-dated and was the basis for establishing the age of the design complex.
Most of the lines are formed on the ground by a shallow trench, with a depth between 10 and 15 cm (4 and 6 in). Such trenches were made by removing the reddish-brown, iron oxide-coated pebbles that cover the surface of the Nazca Desert. When this gravel is removed, the light-colored clay earth exposed in the bottom of the trench contrasts sharply in color and tone with the surrounding land surface, producing visible lines. This sub-layer contains high amounts of lime. With moisture from morning mist, it hardens to form a protective layer that shields the lines from winds, thereby preventing erosion.
The Nazca used this technique to "draw" several hundred simple, but huge, curvilinear animal and human figures. In total, the earthwork project is huge and complex: the area encompassing the lines is nearly 450 km2 (170 sq mi), and the largest figures can span nearly 370 m (1,200 ft). Some figures have been measured: the hummingbird is 93 m (305 ft) long, the condor is 134 m (440 ft), the monkey is 93 by 58 m (305 by 190 ft), and the spider is 47 m (154 ft). The very dry, windless, and constant climate of the Nazca region has preserved the lines well.
Anthropologists, ethnologists, and archaeologists have studied the ancient Nazca culture to try to determine the purpose of the lines and figures. Paul Kosok and Maria Reiche advanced a purpose related to astronomy and cosmology, as has been common in monuments of other ancient cultures: the lines were intended to act as a kind of observatory, to point to the places on the distant horizon where the sun and other celestial bodies rose or set at the solstices. Many prehistoric indigenous cultures in the Americas and elsewhere constructed earthworks that combined such astronomical sighting with their religious cosmology, as did the late Mississippian culture at Cahokia and other sites in present-day United States. Another example is Stonehenge in England. Newgrange in Ireland has tombs that are oriented to admit light at the winter solstice.
Other theories were that the geometric lines could indicate water flow or irrigation schemes, or be a part of rituals to "summon" water. The spiders, birds, and plants may be fertility symbols. It also has been theorized that the lines could act as an astronomical calendar.
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