Sangamon is a river located in central Illinois, flowing approximately 250 miles. It is a tributary of the Illinois River and plays a significant role in the region's ecology and water management. The river's watershed supports various wildlife and is important for local agriculture. The Sangamon County area, named after the river, is known for its rich history and cultural significance. The city of Springfield, the state capital of Illinois, is situated along the Sangamon River. The river has been a vital resource for transportation and settlement since the early days of the state.