The River Darwen is a river located in Lancashire, England. It flows through the towns of Darwen and Blackburn, eventually joining the River Ribble. The river is approximately 12 miles long and is known for its scenic beauty and natural surroundings. The River Darwen is an important part of the local ecosystem and supports various wildlife. It also plays a role in the area's history and development, providing water for industry and recreation. The river is popular for activities such as walking, fishing, and enjoying nature.