The Sangamon River is a principal tributary of the Illinois River, approximately 246 miles long, in central Illinois in the United States. It drains a mostly rural agricultural area and runs through Decatur and past Springfield. The river is associated with the early career of Abraham Lincoln, who was a sometime boatman working on the river, and play…The Sangamon River is a principal tributary of the Illinois River, approximately 246 miles long, in central Illinois in the United States. It drains a mostly rural agricultural area and runs through Decatur and past Springfield. The river is associated with the early career of Abraham Lincoln, who was a sometime boatman working on the river, and played an important role in early European settlement of Illinois, when the area around was known as the "Sangamon River Country". The section of the Sangamon River that flows through Robert Allerton Park near Monticello was named a National Natural Landmark in 1971.
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