The River Yarrow is a 22-mile (35km) waterway flowing from the West Pennine Moors through Lancashire, draining approximately 71km² of catchment before contributing to the River Douglas at Sollom, just upstream of its inlet into the tidal River Ribble. The river passes through a diverse mix of landscapes — from open farmland and ancient woodland (notably at Duxbury) to urban fringes skirting Chorley and surrounding villages including Euxton, Croston, and Eccleston. Once severely degraded by decades of industrial pollution from coal mining, dye works, and bobbin factories, the Yarrow has undergone a remarkable transformation thanks to sustained restoration efforts. Fish passes, riparian fencing, and extensive tree planting have helped return salmon and sea trout to the river for the first time in over a century, and the presence of otters, kingfishers, dippers, and grey wagtails now signals a genuinely recovering ecosystem. The river presents a mixed fishery with a character that shifts considerably from its moorland headwaters to its lower reaches near the Douglas confluence, offering fly anglers, coarse anglers, and casual explorers a surprisingly productive and varied experience within a largely accessible urban and semi-rural setting.