The Peak District is an upland area in England at the southern end of the Pennines. It is mostly in northern Derbyshire, but also includes parts of Cheshire, Greater Manchester, Staffordshire and Yorkshire. An area of great diversity, it is split into the northern Dark Peak, where most of the moorland is found and the geology is gritstone, and the southern White Peak, where most of the population lives and the geology is mainly limestone.