The River Dearne is a remarkable coarse fishing destination in South Yorkshire, England, flowing roughly eastward for more than 50 kilometres (about 30 miles) from its source near Birds Edge in West Yorkshire — at an elevation of approximately 1,076 feet above sea level — before joining the River Don near Conisbrough. The river drains the high ground south and east of Huddersfield and west of Barnsley, passing through Bretton Hall Country Park, Barnsley, Wath, and Mexborough along the way. Once one of Britain's most polluted waterways due to intensive coal mining and textile industry activity throughout the 19th and 20th centuries, the Dearne has undergone a remarkable ecological recovery since the 1980s and now supports a thriving and diverse fish population. The lower river in particular has become an important and well-regarded angling venue, drawing anglers seeking quality coarse fishing in a river that continues to improve year on year.