I couldn’t find even a half-decent map of the Derbyshire Dales administrative area, via search engines. So I made one. Here it is… extracted from deep inside the local Council’s Local Plan PDF and usefully laid onto a wider map showing its relationship to the Peak District, the Staffordshire Moorlands, and the M6 motorway / HS2.
Settlement dot size reflects population size. Green = The Peak District National Park, which the Dales don’t overlap.