Upano Valley Urban Complex
Valle del Upano · Sangay Urban Cluster · Kilamope–Upano Cities · Amazonian Urbanism Upano
Formative to Regional Development (500 BCE–600 CE)·Kilamope (Upano) culture; Sangay phase Huapula·🇪🇨 Morona-Santiago Province, Upano Valley, Ecuador
About
About Upano Valley Urban Complex
2024 Science revelation: 20+ interconnected pre-Columbian cities buried under Amazon forest in the Upano River valley on the eastern Andean flank, occupied 500 BCE–600 CE by Kilamope and Upano cultures (later Sangay phase). Airborne LiDAR stripped the canopy to reveal 6,000+ earthen mounds and plazas arrayed along a 25-km dendritic road-linked urban system with 10-m-wide straight roads, drained fields and cisterns — Amazonia's earliest large-scale urbanism, 1,000 years before Europeans assumed a pristine wilderness. Settlements show dense residential platforms around central plazas, implying populations of ~10–30,000 across the valley.
Why it mattersEarliest evidence of Amazonian urbanism by 1,000 years; demolishes pristine-myth and proves dense eastern Andean-Amazonian civilization contemporaneous with early Maya.
Open questions
Mysteries & theories
Mysteries
- 01Carrying capacity: how Upano soils fed 30,000 without terracing
- 02Cause of abrupt 600 CE collapse across linked cities
Theories
- 01Volcanic eruption of Sangay as punctuated collapse
- 02Anthropogenic fertile black soil (terra preta-like) management before terra preta
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- c.500 BCE–600 CE (Kilamope/Upano) with Sangay reoccupation 800–1400 CE
- Period
- Formative to Regional Development (500 BCE–600 CE)
- Culture
- Kilamope (Upano) culture; Sangay phase Huapula
- Builders
- Upano/Kilamope agrarian urbanists
- Purpose
- Valley-floor urban system with agrarian hinterland and road-linked polities
- Abandoned
- c.600 CE abandonment (volcanic? climate); Sangay re-named later
- Rediscovered
- 2015–2024 Stéphen Rostain (CNRS) LiDAR; published 2024 Science
- Excavation
- Excavation ongoing
500 BCE
Earliest mounds and platform villages founded
100 BCE
Urban dendritic expansion and 25-km road network cut
300 CE
Peak density—6,000 platforms within 300 km²
2024
Rostain et al. Science LiDAR publication rewrites Amazon urban origins
On the ground
Structures & features
2.1170° S · 78.0240° W · 600 m · 3 mapped features
Kilamope Central Plaza Complex
plaza complexCentral 40×40 m plaza with 20 mounds and radiating roads
2.1100° S · 78.0200° WUpano Eastern Road Causeway
causeway10-m-wide straight ditched causeway linking eastern mounds
2.1300° S · 77.9800° WHuapula Drainage Cistern
hydraulicClay-lined reservoir controlling valley-floor drainage
2.0900° S · 78.0500° W
Gallery