Piedras Negras pyā´ᵺräs nā´gräs [key] [Span.,=black stones], ruined city of the Classic era of the Maya , NW Petén, Guatemala, in the Usumacinta valley. Reaching a peak of sculptural achievement (according to one dating system, between 731 and 795), Piedras Negras developed some of the finest pre-Columbian stonework.
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