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The site is a wide, 400 acre plaza consisting of six concentric earthen ridges. The ridges may have originally been six feet high. Aisles intersected the ridges, leading directly from the center to the perimeter. Unique in the configuration of its earthen structures—notably concentric, semi-elliptical ridges of great size—it had no equal in grandeur in its day. The earthen structures were built and enlarged for centuries, with the site reaching its final form at about 1000 BCE. At its height, a permanent population of several thousand people lived on Poverty Point's curving ridges.