Kolomoki Mounds in Blakely, Georgia, near the Chattahoochee River, is one of the largest and earliest Woodland-period earthwork complexes in the southeastern United States and the largest in Georgia. Built by Native peoples associated with the Swift Creek and Weeden Island cultures between about 250 and 950 CE, it became a major center of population and ceremony, with villages around a large plaza and an estimated 1,500 to 2,000 inhabitants at its height. Its surviving mounds include the massive Temple Mound and Mound D, where excavations uncovered burials, pottery, and evidence of ceremonial and astronomical design.