A remarkable archaeological discovery sheds new light on Inca food preservation and trade networks.
During excavations at an ancient Inca administrative center in southern Peru, archaeologists uncovered an extraordinary discovery that offers a rare glimpse into one of the empire’s most ingenious food preservation techniques.
Researchers found two exceptionally well-preserved freeze-dried potatoes—known as chuño—estimated to be around 500 years old, making them significantly older than the founding of the United States. The discovery provides valuable evidence of the sophisticated agricultural knowledge and logistical systems developed by the Inca civilization centuries before European colonization.
The findings were documented in a study published in the Journal of Field Archaeology and have attracted international attention for their rarity and historical significance.
A Rare Discovery at Tambo Viejo
The potatoes were recovered during archaeological investigations at Tambo Viejo, an important Inca administrative center located in the Acarí Valley on Peru’s southern Pacific coast.
Researchers discovered the chuños inside a ceramic storage vessel buried beneath the floor of an Inca structure. Alongside the potatoes were fragments of broken pottery and a damaged spindle whorl, suggesting the storage area was part of everyday life within the settlement.
Although Tambo Viejo sits at a relatively low elevation, scientists believe the potatoes were originally produced high in the Andes before being transported to the coastal settlement.
What Is Chuño?
Chuño is one of the oldest food preservation methods still known today and remains an important part of Andean culture.
The process can only be carried out in the cold, high-altitude regions of the Andes, where potatoes are naturally frozen overnight by mountain temperatures. During the day, they are thawed under the sun and repeatedly trampled to remove excess moisture. This freeze-thaw cycle continues until the potatoes become completely dehydrated.
The result is an incredibly durable food capable of lasting for several years without refrigeration while retaining much of its nutritional value.
For the Inca Empire, chuño represented an ideal food reserve that could be stored in large quantities and transported across vast distances.
Evidence of an Advanced Inca Supply Network
The discovery suggests that freeze-dried potatoes produced in the high Andes were distributed far beyond the mountains.
Because chuño cannot be manufactured in coastal environments like the Acarí Valley, archaeologists believe the potatoes were transported through the extensive road system built by the Inca Empire.
This supports long-standing theories that the Incas maintained an efficient network for moving food, supplies, and resources between different ecological regions, ensuring communities and administrative centers remained well supplied.
The finding illustrates how agricultural innovation and logistics played a fundamental role in sustaining one of the largest civilizations in pre-Columbian America.
A Discovery Unlike Any Other
According to Dr. Lidio Valdez, archaeologist at the University of Calgary and one of the study’s authors, the significance of the discovery was immediately apparent.
“It was obvious that this was not just any find, but a special one.”
The recovered potatoes are believed to date from the 15th or early 16th century, during the height of the Inca Empire.
Remarkably, archaeologists know of only one comparable discovery: another cache of ancient potatoes uncovered at Pachacamac, Peru, more than one hundred years ago.
Because preserved food rarely survives for centuries, discoveries like this are exceptionally uncommon and provide valuable insights into ancient diets, food storage techniques, and daily life.
Looking Toward the Potatoes’ Origins
Researchers hope future scientific analysis will reveal precisely where these potatoes were cultivated.
Identifying their geographic origin could improve our understanding of agricultural production, trade routes, and regional specialization within the Inca Empire.
“It would be ‘cool’ to know the origin of these potatoes,” Dr. Valdez noted, highlighting the potential for future research to uncover even more about one of the world’s most remarkable ancient civilizations.
A Window into Peru’s Living Agricultural Heritage
This discovery is more than an archaeological curiosity—it is a reminder of Peru’s extraordinary agricultural legacy.
Long before modern preservation technologies existed, Andean communities developed innovative methods that allowed food to be stored for years while supporting populations living across dramatically different climates and elevations.
Today, chuño continues to be produced in parts of the Peruvian Andes using techniques that have remained largely unchanged for centuries, connecting modern communities with traditions that date back to the Inca Empire and beyond.