The Upper Calder Valley lies in West Yorkshire in northern England, and covers the towns of Todmorden, Hebden Bridge, Mytholmroyd, Luddendenfoot, and Sowerby Bridge, as well as a number of smaller settlements such as Portsmouth, Cornholme, Walsden and Eastwood. The valley is the upper valley of the River Calder. Major tributaries of the Upper Calder include the Walsden Water, which flows through the large village of Walsden to join the Calder at Todmorden; the Hebden Water, which flows through Hebden Dale to join the Calder at Hebden Bridge; and Cragg Brook, which flows through Cragg Vale to join the Calder at Mytholmroyd.