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Calderdale, westernmost metropolitan borough, metropolitan county of West Yorkshire, England. The borough is part of the historic county of Yorkshire, except for a small area west of Todmorden that belongs to the historic county of Lancashire. Halifax is the administrative centre. The bleak gritstone Pennine moorlands, with scattered sheep farms and reservoirs, rise to an elevation of 1,500 feet (457 metres) above sea level and are deeply scored by the River Calder and many small...