Saint Clair County地形图
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Cahokia Mounds State Historic Site
United States > Illinois > Saint Clair County > Fairmont City
To the south of Monks Mound is the Grand Plaza, a large area that covered roughly 50 acres (20 ha) and measured over 1,600 ft (490 m) in length by over 900 ft (270 m) in width. Researchers originally thought the flat, open terrain in this area reflected Cahokia's location on the Mississippi's alluvial flood…
平均海拔：128 米
