On the eastern side of the Pennines watershed the substantial River Tyne has cut back via the North Tyne to the Cheviot watershed. This has a significant influence on our perception of the northern limit of the Pennines. It is a classic example of river capture. From the watershed there is a general slope towards the east. Upon this slope flow the Coquet, the Wansbeck, the Blyth and the Tyne. The South Tyne rises near the Pennine watershed but the North Tyne has cut north to the Cheviot watershed capturing the head waters of the Wansbeck and the Blyth producing a later defined Pennine watershed. The rivers Tees, Wear, Swale, Ure, Nidd, Wharfe, Aire, Calder and Don flow eastwards to the North Sea.