The Yorkshire Dales are famously beautiful valleys in northern England, but Nidderdale is perhaps the least known of them. Unique among the dales, this scenic valley has three large reservoirs made in the 20th century by damming the River Nidd, creating a haven for birds including rare species. The valley is also rich in human heritage, from mining to Methodism. This 54-mile circuit starts and ends in the charming village of Pateley Bridge, and can be walked comfortably over four to six days.