Chimú Stone Line Links Farming and Ritual Near Chicama

Archaeologists have documented a lengthy, straight stone alignment extending from an ancient settlement on a hilltop towards nearby farmland and a second hill.

Situated beside a newly recorded temple and extensive cultivated land, the feature indicates that Chimú elites, who ruled a formidable pre-Inca society on Peru’s northern coast, connected agricultural labour with organised religious gatherings throughout this landscape.

A line across Chicama

On an arid, exposed plain in Peru’s La Libertad region, precisely arranged rows of stones formed a straight route close to the town of Chicama Pueblo.

Support from the National University of San Marcos (UNMSM) enabled the Chicama Archaeological Program to continue mapping this recently targeted area.

Henry Tantaleán, an archaeologist and UNMSM co-director, followed the alignment across the plain in the direction of far-off fields.

Its course through the farmland pointed to intentional planning on a broader landscape scale and paved the way for further discoveries.

Connecting sacred mountains

Researchers describe the stone alignment as a geoglyph: a large-scale design laid out across open terrain.

At roughly 1.9 kilometres in length, it maintains a direct course comparable to the celebrated Nazca Lines, the enormous ancient images cut into the desert surface of southern Peru.

The feature runs from Cerro Lescano towards Cerro Tres Cruces and may have connected two apus, mountains regarded as sacred in local Andean beliefs.

“This is the first clear example in which a Chimú settlement is linked to other elements of the landscape through a ritual path or geoglyph,” said Tantaleán.

Expansive desert agriculture

Across the Pampas de Lescano, the team recorded field networks spanning about 101 hectares, substantially more land than had previously been documented nearby.

Arched furrows and comb-like raised ridges directed the planting rows, with these arrangements suggesting recurring, coordinated work over numerous growing seasons.

“We are looking at one of the most extensive agricultural landscapes known to the Chimú world and systematically recorded,” Tantaleán emphasized.

Agriculture on this scale would have required reliable water supplies, storage and supervision, helping to account for the nearby ceremonial centre.

Water moved by canals

Smaller channels split off from the Great Summit Canal into the fields, sustaining crops during the dry season.

Those who built the system needed to cut through desert soils, regulate gradients and limit erosion to ensure that water flowed consistently.

Previous studies of the canal connecting the Chicama and Moche valleys-neighbouring river valleys along the northern coast-demonstrated how vast waterways made them a single, jointly managed irrigation network.

Because crop fields would have dried rapidly if the channels failed, authorities probably relied on both ceremony and coercion to ensure continual repairs.

A Chimú temple for cycles

Close to the farmland stood a north-facing stone platform, 2 to 3 metres high, consistent with Chimú architectural arrangements.

The platform measured approximately 40 by 50 metres and overlooked a plaza around 100 by 80 metres in size.

“It is a temple that could have gathered a large number of people,” Tantaleán explained.

Major assemblies at the site could have made sowing and harvesting communal occasions while underlining who held authority over water and labour.

Timeline of Chimú control

Classic Chimú ceramics found on the ground around the platform allow archaeologists to date most activity to between 1100 and 1470 AD.

In this period, Chimú rulers developed Chan Chan near Trujillo on Peru’s northern coast; the site survives as an immense adobe city.

Chimú authorities controlled the area before the Inca arrived, while later administrators may have made use of the same locations.

This extended period of use shows that the valley retained strategic importance for generations, meaning that new discoveries can rapidly alter understandings of its local history.

Soil holds plant clues

Limited excavations within the fields yielded soil samples for phytolith and pollen testing, with laboratory analysis still to come. Phytoliths are minute silica forms left in soil as plants break down.

Earlier research in the valley indicated that maize, squash and beans were cultivated here, while stone hoes were also recovered at the site.

Laboratory findings may establish which crops supplied this complex and reveal how intensively cultivators reused the soil.

Ritual meets management

Throughout this valley corridor, planners seem to have integrated irrigation, cultivation and ceremony into a unified system of obligations.

“Religion, economics, production, and politics came together to drive labor during the Chimú era,” Tantaleán emphasized.

Travelling ritually along the alignment would have presented leaders as masters of time, water and harvest as well as land.

Viewed together, these features make it more difficult to regard the temple and agricultural fields as separate places, even now.

Threats to preservation

Proposed construction now crosses the same plain, where power lines, access roads and private activity are already cutting through archaeological evidence.

Stone alignments can be removed by bulldozers within hours, while erosion can follow once vehicles create new tracks.

“We’re trying to document everything as quickly as possible because no one can guarantee that these remains will still be intact next week,” Tantaleán warned.

Even comprehensive drone documentation cannot substitute for safeguarding the ground itself, so preservation decisions will determine what future excavations can still discover.

What must happen next

The stone alignment, canals, fields and temple form a single managed landscape in which ritual helped coordinate everyday labour.

Protecting the surviving evidence and completing the laboratory analyses could show more clearly how Chimú authority extended into every furrow.