The Calumet River is a waterway located in northeastern Illinois, primarily flowing through the city of Chicago. It is approximately 20 miles long and connects to several other rivers and lakes, including the Little Calumet River and Lake Michigan. The river has played a significant role in the region's industrial development and transportation. Historically, the Calumet River served as a vital route for shipping goods and materials. Today, it is also important for recreational activities, such as fishing and boating. The river's surrounding areas are home to various wildlife and natural habitats, contributing to the local ecosystem.