Todmorden is a market town and civil parish in the Upper Calder Valley in Calderdale, West Yorkshire, England. It is 17 miles from Manchester and in 2001 had a population of 14,941. Todmorden is at the confluence of three steep-sided Pennine valleys and is surrounded by moorlands with outcrops of sandblasted gritstone. The historic boundary between Yorkshire and Lancashire is the River Calder and its tributary, the Walsden Water which run through the town. The administrative border was altered by the Local Government Act 1888 placing the whole of the town within the West Riding. The town is served by Todmorden and Walsden railway station. The town’s name is most commonly pronounced ; is a common alternative, though is often subject to local ridicule if used. Locally, some may also use a rhotic pronunciation, . The traditional dialectal pronunciation is , although many people living in the town also call it “Tod”.