The Rock River is a major river located in the state of Wisconsin and Illinois in the United States. It flows approximately 300 miles, starting from Lake Koshkonong in Wisconsin and eventually emptying into the Mississippi River near the city of Rock Island, Illinois. The river is known for its scenic beauty and recreational opportunities, including fishing, boating, and kayaking. The Rock River basin supports a diverse ecosystem, home to various species of fish and wildlife. Several towns and cities, such as Beloit and Rockford, are situated along its banks, contributing to the local economy and culture. The river also plays a role in agriculture and industry in the surrounding areas.