The Peak District is an upland area in England, most of which lies in northern Derbyshire but also includes parts of Cheshire, Greater Manchester, Staffordshire and Yorkshire.he Peak District was covered by ice during at least one of the ice ages of the last 2 million years (probably the Anglian glaciation of around 450,000 years ago) as evidenced by the patches of glacial till or boulder clay that can be found across the area.