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The area they've looked at are the Amazon lowlands of Bolivia. It's easy to forget that Bolivia has lowlands as a lot of the tourism (and archaelogy) has concentrated on the highlands.

When Prümers & colleagues looked at the data they found two large and complex sites. The architecture is a lot of earthwork. But earthwork doesn't often form neat terraces, complete with a sophisticated system of canals and reservoirs. If you're a fan of pyramids with your ancient civilisations, it has those too.