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Springfield, Sangamon County, Illinois, United States of America (39.79902 -89.64396)
The city is at an elevation of 558 feet (170 m) above sea level. According to the 2010 census, Springfield has a total area of 65.764 square miles (170.33 km2), of which 59.48 square miles (154.05 km2) (or 90.44%) is land and 6.284 square miles (16.28 km2) (or 9.56%) is water. The city is located in the Lower Illinois River Basin, in a large area known as Till Plain. Sangamon County, and the city of Springfield, are in the Springfield Plain subsection of Till Plain. The Plain is underlain by glacial till that was deposited by a large continental ice sheet that repeatedly covered the area during the Illinoian Stage.