Chan Chan is the ruined capital of the Chimú kingdom of Chimor, on the desert coast of northern Peru about 5 km west of Trujillo, at the mouth of the Moche Valley in the La Libertad region. Built from around AD 850 and conquered by the Inca around 1470, it spread over about 20 km², with a dense core of roughly 6 km² holding ten walled palace compounds, and is considered the largest adobe city in the Americas. Because it is made of sun-dried mud brick, rain is its main enemy: UNESCO listed it as a World Heritage Site on 28 November 1986 and put it straight onto the List of World Heritage in Danger, where it has stayed ever since.
The Chimú capital in the Moche Valley, c. 850–1470
Chan Chan lies in a particularly arid stretch of the coastal desert of northern Peru. Almost no rain falls, and the only fresh water arrives in rivers fed by rain and snow in the Andes. The Chimú, who rose on this coast around 900 after the earlier Moche culture, learned to live with that scarcity. Chan Chan first drew water from wells about 15 m deep, then from a network of canals that led water from the Moche River to farmland around the city. A catastrophic flood around 1100 destroyed many canals to the north, and archaeologists think this pushed the Chimú economy away from local subsistence farming and towards resources from beyond the valley.
By the 15th century Chimor controlled about 1,000 km of the Peruvian coastline, making it the largest kingdom of the Late Intermediate Period. Chimú oral history credited the founding of the dynasty, and of Chan Chan, to Taycanamo, who arrived from the sea on a balsa raft. His son Guacricur took the lower Moche Valley, and his grandson Ñancenpinco conquered the upper valley and pushed north and south into neighbouring valleys such as Chicama, Virú and Santa. Estimates of the capital’s population at its peak run from 40,000 to 60,000.
The people spoke Quingnam, a language that died out after the Inca conquest and is barely documented. That gap explains why nobody can say for certain what the name Chan Chan means. It first appears in writing as “Cauchan” in the founding record of Trujillo’s town council in 1536. The linguist Matthias Urban, following Jorge Zevallos Quiñones, treats it as Quingnam and unrecoverable, while Rodolfo Cerrón-Palomino derives it from the Quechua kancha, “fenced place”. Each has rejected the other’s argument.
Ten ciudadelas behind 12-metre adobe walls
The heart of Chan Chan is a set of ten huge walled compounds that archaeologists call ciudadelas. Each was a royal palace containing plazas, storerooms, ceremonial rooms, reservoirs and a burial platform, and the usual reading is that every Chimú king built his own, so the ten compounds may record ten reigns. The city as a whole is roughly triangular. Its compounds have no entrances facing north, the side that gets most sun, and the tallest walls stand on the south-west to block the wind off the ocean.
The only compound open to visitors is Tschudi, also called Nik An, “Centre House”. It has a single entrance, and its walls reach up to 12 m high. They taper from about 5 m thick at the base to 1 m at the top, a profile that helped them stand through earthquakes on this seismic coast. A pool in the middle of the compound was probably used for ceremonies connected with water and fertility.
Outside the palaces lived the rest of the city. Craft workers occupied what archaeologists call SIARs, small irregular agglutinated rooms, which served as homes and workshops for weavers, potters and metalworkers. Smaller courts known as audiencias and adobe mounds called huacas filled out the plan. The compounds were long known by older names, several of them the surnames of explorers and scholars such as Uhle, Squier, Bandelier, Tschudi and Tello. In recent decades they have also been given names in Mochica, such as Utzh An (“Big House”, formerly Gran Chimú) and Ñain An (“Birds House”, formerly Bandelier). Critics point out that Mochica was not the Chimú language, so the new names misrepresent local history.
The whole site is far larger than the part that can be visited. The chart compares the main measured areas.
Fish, pelicans and nets moulded in mud: the friezes
What visitors remember about Chan Chan is the decoration. The adobe walls were plastered smooth and then carved or moulded with long friezes. Two styles appear side by side: a fairly realistic one showing birds, fish and small mammals, and a more geometric one that turns the same subjects into repeating patterns. Crabs, turtles, waves and nets for catching sea creatures such as Spondylus shellfish all appear.
The sea dominates, which makes sense for a capital only a short walk from the Pacific. In the Tschudi compound, rows of fish face north and south; one interpretation reads them as the two currents that shape this coast, the cold Humboldt Current from the south and the warm El Niño water from the north. Alongside them are waves, diamond-shaped fishing nets, pelicans and a creature locally called the anzumito, which combines features of a sea lion and an otter. Spondylus shells, which grow only in the warm waters off present-day Ecuador, were precious to the Chimú and traded widely.
Chimú religion fits the same pattern. Unlike the Inca, the Chimú held the Moon to be more powerful than the Sun, and Tschudi is thought to have honoured a sea deity whose Quingnam name is lost. A Chimú belief held that the Sun created three eggs, gold for rulers and nobles, silver for their wives and copper for everyone else. Chimú craftsmen worked copper, gold, silver, bronze and the gold-copper alloy tumbaga, and produced shiny black pottery fired in closed kilns.
Topa Inca Yupanqui and the fall of Chimor around 1470
Chimor was the last kingdom with any real chance of stopping the expanding Inca. In the 1470s Topa Inca Yupanqui moved against it and defeated its ruler Minchançaman, a descendant of Taycanamo. The city’s weakness was its water: the canals ran for many kilometres down the Moche Valley, and the Inca cut them, leaving the fields to die. The conquest was nearly complete by 1493, when Huayna Capac became emperor.
The Inca then broke up Chimú society through mitma, the forced resettlement of conquered communities into other parts of the empire, and Chan Chan went into decline. The Spanish founded Trujillo nearby in the 1530s and looted the tombs; one 16th-century record lists treasure from a single burial worth 80,000 pesos of gold. Modern excavation began in 1969 under Michael Moseley and Carol J. Mackey, and Peruvian heritage agencies have continued the work since.
El Niño rains and the World Heritage in Danger list since 1986
For a city built of mud in a desert, the danger comes from El Niño. In ordinary years the coast stays almost rainless, but El Niño events bring warm water and heavy rain, floods and strong winds to northern Peru. Rain soaks the base of the walls, and the rising damp then carries salt and encourages plant growth, both of which crumble the adobe from below. Some climate models suggest a warming world will bring more of this rain.
When UNESCO inscribed the “Chan Chan Archaeological Zone” in 1986, it placed the site on the Danger list on the same day and asked Peru to halt any excavation without conservation, stop looting and put a management plan in place. A Master Plan for conservation and management was drawn up in 1998 by Peru’s National Institute of Culture with ICCROM, the Getty Conservation Institute and other partners. Conservators have built rain covers over the most exposed walls and new drainage to carry water away faster, and since 2000 there has been an emergency and disaster plan. The site still has 46 points of critical damage, whose repair the La Libertad regional government funds. People add to the damage too: in May 2025 a vandal sprayed paint on the walls.
New tools help record the site before more is lost. Until recently the most detailed map was one made by Harvard University in 1974. An Italian mission working at Chan Chan since 2002 has used drones and photogrammetry to build 3D models of the Tschudi compound: a 2017 survey led by Roberto Pierdicca took 1,856 aerial images to model the palace. Between 2016 and 2022 Italian and Peruvian researchers also built a digital heritage model of the Huaca Arco Iris, a decorated adobe platform from the same early phase as the first buildings at Chan Chan, which was probably used for funerary ceremonies and had much of its walls restored in 1963. The aim is to keep monitoring the adobe so that damage is caught early and the data survives even where the walls do not. In 2026 archaeologists announced a newly opened Chimú mausoleum in the Utzh An compound holding the remains of more than 30 people.
The climate pattern behind the threat is explained in our guide to El Niño and La Niña, the desert coast that preserved Chan Chan is described in the article on the climate of Peru, and the empire that conquered Chimor and cut its canals is the subject of our look at Inca geography.