Chew Valley in Saddleworth, Greater Manchester, England, follows the course of Chew Brook on the western slopes of Black Chew Head to where it joins the River Tame at Greenfield, east of Manchester. Part of the higher fringes of the valley towards the peak of Black Chew Head lie across the boundary in Derbyshire. The eastern part of the valley including the reservoirs of Dovestone and Chew are within the north western extremity of the Peak District National Park.