Middleton-in-Teesdale is a village in County Durham, ten miles northwest of Barnard Castle. It's in the scenic Tees valley, where the main visitor attraction is High Force waterfall.
The lower River Tees is mostly industrial, but its upper valley between Cow Green and Barnard Castle lies in scenic moorland, part of the North Pennines Area of Outstanding Natural Beauty. As with other AONBs, the "natural beauty" is partly man-made, through hill farming and 18th / 19th century lead mining. The Tees foams over a series of waterfalls as it cascades down Whin Sill - the layers of tough dolerite formed from magma in the late Carboniferous period, which elsewhere form Hadrian's Wall and the Farne Islands. There is some quarrying in the area, beware big trucks along the lanes, and the threat of further mining hasn't entirely gone away. There was interest in mining zinc here when its price spiked in 2006, but nothing has come of this.