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Allerdale, district, administrative county of Cumbria, historic county of Cumberland, northwestern England. It is located in the northwestern part of the county along the coast of the Solway Firth. Workington, on the western Cumbrian seacoast, is the administrative centre. Except for its coastal plain on the west and northwest, Allerdale is a scenic district of mountains and lake-filled valleys forming the northwestern part of Lake District National Park in the Cumbrian Mountains. The two most-populated...