Just Interesting Stories - New Discoveries in the Amazon Rain Forest.
There are vast areas of the Southern Amazon which are now thought to have hosted extremely large human communities.
In the area of Mato Groso in Brazil, anthropologists discovered a network of towns and villages surrounded by walls. These areas, which are now overgrown with tropical rain forest, cover an area of approximately 30,000 square killometres. Some towns occupied areas covering 60 hectares. The settlements date from 1250 to 1650 before European colonists arrived, most probably bringing with them diseases that the native people could not fight off.
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