The Koshkonong River is a tributary of the Rock River located in Wisconsin, USA. It flows through Jefferson County and is approximately 30 miles long. The river is known for its scenic beauty and is a popular spot for fishing, kayaking, and wildlife observation. The river's watershed includes several lakes, including Lake Koshkonong, which is the largest lake in the area. The Koshkonong River plays an important role in the local ecosystem, providing habitat for various species of fish and birds. It also contributes to the region's recreational opportunities and natural resources.