Archaeologists have discovered two samples of chuño—a traditional Andean freeze-dried potato—at the Tambo Viejo site in Peru’s Acarí Valley. According to research published in the Journal of Field Archaeology, the find confirms that the Inca Empire transported this preserved food source hundreds of miles from the high-altitude Andes to the arid Pacific coast, providing rare physical evidence of ancient Incan logistics.
How was the Inca freeze-drying process developed?
The production of chuño relies on the extreme temperature fluctuations found at altitudes of 3,600 meters or higher. By exposing potatoes to freezing night temperatures and the intense heat of the Andean sun, producers evaporated nearly all moisture from the tubers. Once dried, the potatoes become lightweight and shelf-stable for decades.
The Inca utilized this same freeze-drying technique to preserve meat, creating a product known as charki. This term is the direct linguistic ancestor of the modern English word “jerky,” according to Lidio Valdez.
Why is finding chuño at an archaeological site rare?
Chuño is an exceptionally fragile organic product that rarely survives in the archaeological record. The Tambo Viejo discovery, led by Lidio Valdez and independent archaeologist Katrina Bettcher, marks only the second time chuño has been identified at an Incan site. The samples were found at the bottom of a broken clay pot inside a small storage room, alongside a ceramic fragment and a broken spindle whorl used for spinning fibers.
The preservation of these samples is attributed to the hyper-arid conditions of the Acarí Valley. These same environmental factors previously allowed Lidio Valdez to recover naturally mummified guinea pigs (Cavia porcellus) in the region. Without such extreme dryness, the potatoes would have rotted within a week, as potatoes contain approximately 80% water.
What does this discovery reveal about Incan supply chains?
The presence of chuño in the Acarí Valley demonstrates that the Inca Empire maintained complex, long-distance supply routes. Because the product can only be manufactured in high-altitude environments, the samples discovered at Tambo Viejo must have been transported hundreds of kilometers across the Incan road network, likely via llama caravans. “Since chuño is a lightweight product, it probably also facilitated its transport,” Lidio Valdez noted.
Archaeologists often look for storage-related artifacts, such as broken pottery or specialized containers, to identify food distribution hubs in ancient settlements.
How can ancient preservation lessons apply today?
Beyond its historical significance, the study suggests that ancient methods of food security remain relevant in the modern era. Lidio Valdez argues that humanity has much to learn from how past civilizations managed food resources, particularly in an age where food waste is a major global concern. As researchers continue to systematically excavate Incan sites along the Peruvian coast, they expect to uncover further evidence of the extensive supply chains that once sustained the empire.
Frequently Asked Questions
What is chuño?
Chuño is a freeze-dried potato product created by alternating freezing and sun-drying, allowing it to be stored for years without spoiling.
Where was the chuño found?
The samples were found at Tambo Viejo, an Incan provincial center located in the Acarí Valley of southern Peru.
How did the Inca transport food across their empire?
The Inca utilized an extensive road network and llama caravans to move goods, including lightweight, preserved foods like chuño, from high-altitude production centers to coastal regions.
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