Louth, Lincolnshire miles Scunthorpe, Skegness, Stamford (6,900 km^2) 816 square Londonderry miles Londonderry, Coleraine, Limavady (2,100 km^2) 780 square Bala, Barmouth, Blaenau Ffestiniog, Dolgellau, Merionethshire miles Harlech, Towyn (2,000 km^2) 548 square Peeblesshire miles Peebles, Innerleithen, West Linton (1,400 km^2) Water 27 sq mi (155,690 km^2) Discharge - average 848 cu ft/s (3,771.0 m^3/s) Basin features Progression Loire→ Atlantic Ocean Atlantic peekytoe crab, spanner crab, perch, Lake Victoria mackerel, cuttlefish, eastern oyster, perch, yellow perch, Sardines Pacific oyster European oyster, sea urchin Medium Black sea bass, and flatfish.