town (parish), Allerdale district, administrative county of Cumbria, historic county of Cumberland, England. It lies at the north end of the Derwent Water (lake), below the peak of Skiddaw. Keswick is the main transportation focus, tourist resort, and shopping centre of the northern part of Lake District National Park. Lead mining was formerly of economic importance. The local museum contains relics of the rich geologic, folk, and art associations of the region. Pop. (2001) 4,984.