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🇧🇷 Brazil · Ancient city
Late Pre-Columbian (800–1600 CE) · Upper Xingu / ancestral Kuikuro Arawak
Eastern plaza K10 of Kuhikugu cluster on Seki East — 12 ha plaza with ditch and 1.2 km causeway.
🇧🇷 Brazil · Ancient village
Late Pre-Columbian (900 – 1650 CE) · Xinguano Arawak / Kuhikugu
Western Kuhikugu plaza K9 250×150 m at Seki Lake west — causeway 500 m ×12 m and reservoir 100 m under gallery forest; Xinguano.
🇧🇷 Brazil · Ancient village
Late Pre-Columbian (900 – 1650 CE) · Xinguano Arawak / Kuhikugu
Western Kuhikugu plaza K9 250×150 m at Seki Lake west — causeway 500 m ×12 m and reservoir 100 m under gallery forest; Xinguano.
🇺🇸 United States · Earthwork
Late Woodland – early Mississippian, Plum Bayou 650–1050 CE · Plum Bayou (aboriginal ancestors of Quapaw? Coles Creek related, not Caddo Mississippian)
Best-preserved Plum Bayou-culture platform-mound center (650–1050 CE) – 18 mounds (two tallest 15 m and 12 m) arranged geometrically around rectangular plazas and an earthwork embankment with…
🇺🇸 United States · Earthwork
Mississippian 1000–1450 CE, apogee 1200–1350 CE · Mississippian (ancestral Choctaw/Chickasaw)
29-mound plaza center with grand chief's platform mound above Black Warrior River.
