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(the hills), a culture that constructed over 20,000 man-made artificial hills, all interconnected by thousands of square kilometers of aqueducts, channels, embankments, artificial lakes and lagoons, as well as terraces. Between about 4000 BC (and probably earlier as this date is taken from ceramics that have been carbon dated) and the 13th century AD this region was settled by sophisticated and organized groups of human societies. Their civil structures were based, both environmentally and economically, on the use of specific environmental characteristics

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