The River Irthing is a beautiful and productive tributary of the River Eden, rising on Paddaburn Moor in the remote Border Forest Park and flowing through some of the most scenic countryside in northern England. For the first 15 miles of its course, the river marks the border between Cumbria and Northumberland, passing through an area of complex geology overlain by glacial drift and peat. The river flows alongside much of Hadrian's Wall, adding a remarkable historical dimension to any fishing trip. After passing Brampton, it is joined by the River Gelt before eventually meeting the Eden at Warwick Bridge near Carlisle. The water carries a characteristic peat stain, giving it a warm amber hue, and the banks are frequently lined with trees that provide both shade and a steady supply of terrestrial insects to the surface. The Irthing is managed in part by the Brampton Angling Association (BAA), which controls several miles of fishing on the river.