New research challenges the idea that great infrastructure requires powerful rulers.
Satellite imagery of northern Colombia’s wetlands revealed an extraordinary human experiment: thousands of raised fields and canals spanning more than 500,000 hectares. That’s an area three times bigger than Greater London. But that’s just the first part of it.
New research suggests the communities that built it may not have needed kings, bureaucrats or a central authority directing the work. Instead, relatively small groups could have built and maintained the system through collective labour — a finding that challenges a stubborn assumption about how complex societies work.
A giant system without a giant government The landscape lies in La Mojana, a vast floodplain where the Magdalena, Cauca and San Jorge river systems converge. In the centuries before Christ, pre-Hispanic communities reshaped this watery terrain into networks of canals and elevated strips of farmland.
This had a very practical component. The channels moved water and fertile sediment. Raised fields kept crops above seasonal floods. Some structures may even have funneled fish toward settlements.
The system remained in use, in changing forms, until roughly the 10th or 11th century. So, the structure wasn’t really a city, or at least not as we’d envision a city today. Human settlements were dispersed, and the large network grew and accumulated over centuries.
Scientists can’t say for sure whether it all operated simultaneously at any point. But its sheer scale encouraged archaeologists to assume that powerful leaders must have organized the work.
That’s where the new study comes in and says “not really.”