That park contains Dark Peak in its north and White Peak in its South and contains a feature called Thor's Cave in its Manifold Valley.
The semi-precious mineral Blue John is only found in this mountain range's Blue John cavern and Treak Cliff Cavern near the city of Castleton. One national park in this range is thought to be the world's second most visited after Mount Fuji. That park contains Dark Peak in its north and White Peak in its South and contains a feature called Thor's Cave in its Manifold Valley. The (*) Cheviot Hills is a northern extension of this mountain range, which in other areas transitions into the Rossendale and Bowland Fells. This range is home to a namesake trail that extends from Edale to the city of Kirk Yetholm south of the Firth of Forth. The ► Peak District National Park in Derbyshire is the southern terminus of, for 10 points, what mountain range that forms the backbone of England? 
The semi-precious mineral Blue John is only found in this mountain range's Blue John cavern and Treak Cliff Cavern near the city of Castleton.
Pennines